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RPC update

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This commit is contained in:
Joseph Henry 2016-01-12 09:46:49 -08:00
parent c6571073fe
commit e2ae9165c6
6 changed files with 136 additions and 107 deletions
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12
make-linux.mk
View File

@ -95,24 +95,18 @@ one: $(OBJS) service/OneService.o one.o osdep/LinuxEthernetTap.o
ln -sf zerotier-one zerotier-idtool ln -sf zerotier-one zerotier-idtool
ln -sf zerotier-one zerotier-cli ln -sf zerotier-one zerotier-cli
netcon: rpc_lib $(OBJS) netcon: $(OBJS)
rm -f *.o rm -f *.o
# Need to selectively rebuild one.cpp and OneService.cpp with ZT_SERVICE_NETCON and ZT_ONE_NO_ROOT_CHECK defined, and also NetconEthernetTap # Need to selectively rebuild one.cpp and OneService.cpp with ZT_SERVICE_NETCON and ZT_ONE_NO_ROOT_CHECK defined, and also NetconEthernetTap
$(CXX) $(CXXFLAGS) $(LDFLAGS) -DZT_SERVICE_NETCON -DZT_ONE_NO_ROOT_CHECK -Iext/lwip/src/include -Iext/lwip/src/include/ipv4 -Iext/lwip/src/include/ipv6 -o zerotier-netcon-service $(OBJS) service/OneService.cpp netcon/NetconEthernetTap.cpp one.cpp $(LDLIBS) -ldl -Lnetcon/ -lrpc $(CXX) $(CXXFLAGS) $(LDFLAGS) -DZT_SERVICE_NETCON -DZT_ONE_NO_ROOT_CHECK -Iext/lwip/src/include -Iext/lwip/src/include/ipv4 -Iext/lwip/src/include/ipv6 -o zerotier-netcon-service $(OBJS) service/OneService.cpp netcon/NetconEthernetTap.cpp one.cpp -x c netcon/RPC.c $(LDLIBS) -ldl
# Build netcon/liblwip.so which must be placed in ZT home for zerotier-netcon-service to work # Build netcon/liblwip.so which must be placed in ZT home for zerotier-netcon-service to work
cd netcon ; make -f make-liblwip.mk cd netcon ; make -f make-liblwip.mk
# Use gcc not clang to build standalone intercept library since gcc is typically used for libc and we want to ensure maximal ABI compatibility # Use gcc not clang to build standalone intercept library since gcc is typically used for libc and we want to ensure maximal ABI compatibility
cd netcon ; gcc -Wl,--whole-archive -g -O2 -Wall -std=c99 -fPIC -DVERBOSE -D_GNU_SOURCE -DNETCON_INTERCEPT -I. -nostdlib -shared librpc.a -o libzerotierintercept.so Intercept.c -ldl cd netcon ; gcc -g -O2 -Wall -std=c99 -fPIC -DVERBOSE -D_GNU_SOURCE -DNETCON_INTERCEPT -I. -nostdlib -shared -o libzerotierintercept.so Intercept.c RPC.c -ldl
cp netcon/libzerotierintercept.so libzerotierintercept.so cp netcon/libzerotierintercept.so libzerotierintercept.so
ln -sf zerotier-netcon-service zerotier-cli ln -sf zerotier-netcon-service zerotier-cli
ln -sf zerotier-netcon-service zerotier-idtool ln -sf zerotier-netcon-service zerotier-idtool
rpc_lib:
g++ -c -fPIC -lpthread netcon/RPC.c -DVERBOSE -o netcon/RPC.o
ar -rv netcon/librpc.a netcon/RPC.o
selftest: $(OBJS) selftest.o selftest: $(OBJS) selftest.o
$(CXX) $(CXXFLAGS) $(LDFLAGS) -o zerotier-selftest selftest.o $(OBJS) $(LDLIBS) $(CXX) $(CXXFLAGS) $(LDFLAGS) -o zerotier-selftest selftest.o $(OBJS) $(LDLIBS)
$(STRIP) zerotier-selftest $(STRIP) zerotier-selftest

75
netcon/Intercept.c
View File

@ -62,7 +62,7 @@
------------------- Intercept<--->Service Comm mechanisms ---------------------- ------------------- Intercept<--->Service Comm mechanisms ----------------------
------------------------------------------------------------------------------*/ ------------------------------------------------------------------------------*/
static char *network_pathname = (char *)0; static char *netpath = (char *)0;
/* Check whether the socket is mapped to the service or not. We /* Check whether the socket is mapped to the service or not. We
need to know if this is a regular AF_LOCAL socket or an end of a socketpair need to know if this is a regular AF_LOCAL socket or an end of a socketpair
@ -79,7 +79,7 @@ static int connected_to_service(int sockfd)
getpeername(sockfd, (struct sockaddr*)&addr, &len); getpeername(sockfd, (struct sockaddr*)&addr, &len);
if (addr.ss_family == AF_LOCAL || addr.ss_family == AF_LOCAL) { if (addr.ss_family == AF_LOCAL || addr.ss_family == AF_LOCAL) {
addr_un = (struct sockaddr_un*)&addr; addr_un = (struct sockaddr_un*)&addr;
if(strcmp(addr_un->sun_path, network_pathname) == 0) { if(strcmp(addr_un->sun_path, netpath) == 0) {
dwr(MSG_DEBUG_EXTRA,"connected_to_service(): Yes, %s\n", addr_un->sun_path); dwr(MSG_DEBUG_EXTRA,"connected_to_service(): Yes, %s\n", addr_un->sun_path);
return 1; return 1;
} }
@ -115,12 +115,11 @@ static int set_up_intercept()
realsyscall = dlsym(RTLD_NEXT, "syscall"); realsyscall = dlsym(RTLD_NEXT, "syscall");
realgetsockname = dlsym(RTLD_NEXT, "getsockname"); realgetsockname = dlsym(RTLD_NEXT, "getsockname");
} }
if (!netpath) {
if (!network_pathname) { netpath = getenv("ZT_NC_NETWORK");
network_pathname = getenv("ZT_NC_NETWORK"); if (!netpath)
if (!network_pathname)
return 0; return 0;
dwr(MSG_DEBUG,"Connecting to service at: %s\n", network_pathname); dwr(MSG_DEBUG,"Connecting to service at: %s\n", netpath);
/* Hook/intercept Posix net API symbols */ /* Hook/intercept Posix net API symbols */
rpc_mutex_init(); rpc_mutex_init();
} }
@ -194,6 +193,14 @@ int socket(SOCKET_SIG)
errno = EINVAL; errno = EINVAL;
return -1; return -1;
} }
/*
if(flags & SOCK_DGRAM) {
fprintf(stderr, "socket(): DGRAM, passing through\n");
return realsocket(socket_family, socket_type, protocol);
}
*/
socket_type &= SOCK_TYPE_MASK; socket_type &= SOCK_TYPE_MASK;
/* Check protocol is in range */ /* Check protocol is in range */
if (socket_family < 0 || socket_family >= NPROTO){ if (socket_family < 0 || socket_family >= NPROTO){
@ -219,7 +226,7 @@ int socket(SOCKET_SIG)
rpc_st.protocol = protocol; rpc_st.protocol = protocol;
rpc_st.__tid = syscall(SYS_gettid); rpc_st.__tid = syscall(SYS_gettid);
/* -1 is passed since we we're generating the new socket in this call */ /* -1 is passed since we we're generating the new socket in this call */
return rpc_send_command(RPC_SOCKET, -1, &rpc_st, sizeof(struct socket_st)); return rpc_send_command(netpath, RPC_SOCKET, -1, &rpc_st, sizeof(struct socket_st));
} }
/*------------------------------------------------------------------------------ /*------------------------------------------------------------------------------
@ -233,9 +240,42 @@ int connect(CONNECT_SIG)
if (!set_up_intercept()) if (!set_up_intercept())
return realconnect(__fd, __addr, __len); return realconnect(__fd, __addr, __len);
dwr(MSG_DEBUG,"connect(%d):\n", __fd); /*
int opt;
socklen_t opt_len;
realgetsockopt(__fd, SOL_SOCKET, SO_TYPE, (void *) &opt, &opt_len);
if(opt & SOCK_DGRAM)
{
fprintf(stderr, "connect(): DGRAM, passing through.\n");
return realconnect(__fd, __addr, __len);
}
*/
struct sockaddr_in *connaddr; struct sockaddr_in *connaddr;
connaddr = (struct sockaddr_in *) __addr; connaddr = (struct sockaddr_in *)__addr;
if(__addr->sa_family == AF_LOCAL || __addr->sa_family == AF_UNIX) {
struct sockaddr_storage storage;
memcpy(&storage, __addr, __len);
struct sockaddr_un *s_un = (struct sockaddr_un*)&storage;
fprintf(stderr, "connect(): address = %s\n", s_un->sun_path);
}
int port = connaddr->sin_port;
int ip = connaddr->sin_addr.s_addr;
unsigned char d[4];
d[0] = ip & 0xFF;
d[1] = (ip >> 8) & 0xFF;
d[2] = (ip >> 16) & 0xFF;
d[3] = (ip >> 24) & 0xFF;
dwr(MSG_DEBUG,"connect(): %d.%d.%d.%d: %d\n", d[0],d[1],d[2],d[3], ntohs(port));
if (!set_up_intercept())
return realconnect(__fd, __addr, __len);
dwr(MSG_DEBUG,"connect(%d):\n", __fd);
/* Check that this is a valid fd */ /* Check that this is a valid fd */
if(fcntl(__fd, F_GETFD) < 0) { if(fcntl(__fd, F_GETFD) < 0) {
errno = EBADF; errno = EBADF;
@ -261,8 +301,7 @@ int connect(CONNECT_SIG)
|| connaddr->sin_family == PF_NETLINK || connaddr->sin_family == PF_NETLINK
|| connaddr->sin_family == AF_NETLINK || connaddr->sin_family == AF_NETLINK
|| connaddr->sin_family == AF_UNIX)) { || connaddr->sin_family == AF_UNIX)) {
int err = realconnect(__fd, __addr, __len); return realconnect(__fd, __addr, __len);
return err;
} }
/* Assemble and send RPC */ /* Assemble and send RPC */
struct connect_st rpc_st; struct connect_st rpc_st;
@ -270,7 +309,7 @@ int connect(CONNECT_SIG)
rpc_st.__fd = __fd; rpc_st.__fd = __fd;
memcpy(&rpc_st.__addr, __addr, sizeof(struct sockaddr_storage)); memcpy(&rpc_st.__addr, __addr, sizeof(struct sockaddr_storage));
memcpy(&rpc_st.__len, &__len, sizeof(socklen_t)); memcpy(&rpc_st.__len, &__len, sizeof(socklen_t));
return rpc_send_command(RPC_CONNECT, __fd, &rpc_st, sizeof(struct connect_st)); return rpc_send_command(netpath, RPC_CONNECT, __fd, &rpc_st, sizeof(struct connect_st));
} }
/*------------------------------------------------------------------------------ /*------------------------------------------------------------------------------
@ -325,7 +364,7 @@ int bind(BIND_SIG)
rpc_st.__tid = syscall(SYS_gettid); rpc_st.__tid = syscall(SYS_gettid);
memcpy(&rpc_st.addr, addr, sizeof(struct sockaddr_storage)); memcpy(&rpc_st.addr, addr, sizeof(struct sockaddr_storage));
memcpy(&rpc_st.addrlen, &addrlen, sizeof(socklen_t)); memcpy(&rpc_st.addrlen, &addrlen, sizeof(socklen_t));
return rpc_send_command(RPC_BIND, sockfd, &rpc_st, sizeof(struct bind_st)); return rpc_send_command(netpath, RPC_BIND, sockfd, &rpc_st, sizeof(struct bind_st));
} }
/*------------------------------------------------------------------------------ /*------------------------------------------------------------------------------
@ -398,10 +437,6 @@ int accept(ACCEPT_SIG)
if(addr) if(addr)
addr->sa_family = AF_INET; addr->sa_family = AF_INET;
/* The following line is required for libuv/nodejs to accept connections properly,
however, this has the side effect of causing certain webservers to max out the CPU
in an accept loop */
//fcntl(sockfd, F_SETFL, SOCK_NONBLOCK);
int new_fd = get_new_fd(sockfd); int new_fd = get_new_fd(sockfd);
if(new_fd > 0) { if(new_fd > 0) {
errno = ERR_OK; errno = ERR_OK;
@ -452,7 +487,7 @@ int listen(LISTEN_SIG)
rpc_st.sockfd = sockfd; rpc_st.sockfd = sockfd;
rpc_st.backlog = backlog; rpc_st.backlog = backlog;
rpc_st.__tid = syscall(SYS_gettid); rpc_st.__tid = syscall(SYS_gettid);
return rpc_send_command(RPC_LISTEN, sockfd, &rpc_st, sizeof(struct listen_st)); return rpc_send_command(netpath, RPC_LISTEN, sockfd, &rpc_st, sizeof(struct listen_st));
} }
/*------------------------------------------------------------------------------ /*------------------------------------------------------------------------------
@ -490,7 +525,7 @@ int getsockname(GETSOCKNAME_SIG)
rpc_st.sockfd = sockfd; rpc_st.sockfd = sockfd;
memcpy(&rpc_st.addr, addr, *addrlen); memcpy(&rpc_st.addr, addr, *addrlen);
memcpy(&rpc_st.addrlen, &addrlen, sizeof(socklen_t)); memcpy(&rpc_st.addrlen, &addrlen, sizeof(socklen_t));
int rpcfd = rpc_send_command(RPC_GETSOCKNAME, sockfd, &rpc_st, sizeof(struct getsockname_st)); int rpcfd = rpc_send_command(netpath, RPC_GETSOCKNAME, sockfd, &rpc_st, sizeof(struct getsockname_st));
/* read address info from service */ /* read address info from service */
char addrbuf[sizeof(struct sockaddr_storage)]; char addrbuf[sizeof(struct sockaddr_storage)];
memset(&addrbuf, 0, sizeof(struct sockaddr_storage)); memset(&addrbuf, 0, sizeof(struct sockaddr_storage));

57
netcon/NetconEthernetTap.cpp
View File

@ -63,15 +63,6 @@ namespace ZeroTier {
// --------------------------------------------------------------------------- // ---------------------------------------------------------------------------
// Gets the process/path name associated with a pid
static void get_path_from_pid(char* dest, int pid)
{
char ppath[80];
sprintf(ppath, "/proc/%d/exe", pid);
if (readlink (ppath, dest, 80) != -1){
}
}
static err_t tapif_init(struct netif *netif) static err_t tapif_init(struct netif *netif)
{ {
// Actual init functionality is in addIp() of tap // Actual init functionality is in addIp() of tap
@ -438,10 +429,12 @@ void NetconEthernetTap::closeConnection(PhySocket *sock)
if(conn) { if(conn) {
if(!conn->pcb) if(!conn->pcb)
return; return;
// TODO: Removed to address double-free segfault when killing a python simple server
// tell LWIP to close the associated PCB // tell LWIP to close the associated PCB
if(conn->pcb->state != CLOSED && lwipstack->_tcp_close(conn->pcb) != ERR_OK) { //if(conn->pcb->state != CLOSED && lwipstack->_tcp_close(conn->pcb) != ERR_OK) {
dwr(MSG_ERROR," closeConnection(): Error while calling tcp_close()\n"); // dwr(MSG_ERROR," closeConnection(): Error while calling tcp_close()\n");
} //}
// remove from connection list // remove from connection list
for(size_t i=0; i<tcp_connections.size(); i++) { for(size_t i=0; i<tcp_connections.size(); i++) {
if(tcp_connections[i]->sock == sock){ if(tcp_connections[i]->sock == sock){
@ -478,7 +471,7 @@ void NetconEthernetTap::phyOnUnixAccept(PhySocket *sockL,PhySocket *sockN,void *
/* Unpacks the buffer from an RPC command */ /* Unpacks the buffer from an RPC command */
void NetconEthernetTap::unload_rpc(void *data, pid_t &pid, pid_t &tid, void NetconEthernetTap::unload_rpc(void *data, pid_t &pid, pid_t &tid,
int &rpc_count, char (timestamp[20]), char (magic[sizeof(uint64_t)]), char &cmd, void* &payload) int &rpc_count, char (timestamp[20]), char (CANARY[sizeof(uint64_t)]), char &cmd, void* &payload)
{ {
unsigned char *buf = (unsigned char*)data; unsigned char *buf = (unsigned char*)data;
memcpy(&pid, &buf[IDX_PID], sizeof(pid_t)); memcpy(&pid, &buf[IDX_PID], sizeof(pid_t));
@ -486,7 +479,7 @@ void NetconEthernetTap::unload_rpc(void *data, pid_t &pid, pid_t &tid,
memcpy(&rpc_count, &buf[IDX_COUNT], sizeof(int)); memcpy(&rpc_count, &buf[IDX_COUNT], sizeof(int));
memcpy(timestamp, &buf[IDX_TIME], 20); memcpy(timestamp, &buf[IDX_TIME], 20);
memcpy(&cmd, &buf[IDX_PAYLOAD], sizeof(char)); memcpy(&cmd, &buf[IDX_PAYLOAD], sizeof(char));
memcpy(magic, &buf[IDX_PAYLOAD+1], MAGIC_SIZE); memcpy(CANARY, &buf[IDX_PAYLOAD+1], CANARY_SIZE);
} }
/* /*
@ -494,14 +487,14 @@ void NetconEthernetTap::unload_rpc(void *data, pid_t &pid, pid_t &tid,
*/ */
void NetconEthernetTap::phyOnUnixData(PhySocket *sock,void **uptr,void *data,unsigned long len) void NetconEthernetTap::phyOnUnixData(PhySocket *sock,void **uptr,void *data,unsigned long len)
{ {
uint64_t magic_num; uint64_t CANARY_num;
pid_t pid, tid; pid_t pid, tid;
int rpc_count; int rpc_count;
char cmd, timestamp[20], magic[MAGIC_SIZE]; char cmd, timestamp[20], CANARY[CANARY_SIZE];
void *payload; void *payload;
unsigned char *buf = (unsigned char*)data; unsigned char *buf = (unsigned char*)data;
std::pair<PhySocket*, void*> sockdata; std::pair<PhySocket*, void*> sockdata;
PhySocket *streamsock, *rpcsock; PhySocket *rpcsock;
bool found_job = false, detected_rpc = false; bool found_job = false, detected_rpc = false;
TcpConnection *conn; TcpConnection *conn;
int wlen = len; int wlen = len;
@ -515,8 +508,8 @@ void NetconEthernetTap::phyOnUnixData(PhySocket *sock,void **uptr,void *data,uns
detected_rpc = true; detected_rpc = true;
} }
if(detected_rpc) { if(detected_rpc) {
unload_rpc(data, pid, tid, rpc_count, timestamp, magic, cmd, payload); unload_rpc(data, pid, tid, rpc_count, timestamp, CANARY, cmd, payload);
memcpy(&magic_num, magic, MAGIC_SIZE); memcpy(&CANARY_num, CANARY, CANARY_SIZE);
dwr(MSG_DEBUG," <%x> RPC: (pid=%d, tid=%d, rpc_count=%d, timestamp=%s, cmd=%d)\n", sock, pid, tid, rpc_count, timestamp, cmd); dwr(MSG_DEBUG," <%x> RPC: (pid=%d, tid=%d, rpc_count=%d, timestamp=%s, cmd=%d)\n", sock, pid, tid, rpc_count, timestamp, cmd);
if(cmd == RPC_SOCKET) { if(cmd == RPC_SOCKET) {
dwr(MSG_DEBUG," <%x> RPC_SOCKET\n", sock); dwr(MSG_DEBUG," <%x> RPC_SOCKET\n", sock);
@ -530,7 +523,7 @@ void NetconEthernetTap::phyOnUnixData(PhySocket *sock,void **uptr,void *data,uns
} }
} }
else { // All RPCs other than RPC_SOCKET else { // All RPCs other than RPC_SOCKET
jobmap[magic_num] = std::make_pair<PhySocket*, void*>(sock, data); jobmap[CANARY_num] = std::make_pair<PhySocket*, void*>(sock, data);
} }
write(_phy.getDescriptor(sock), "z", 1); // RPC ACK byte to maintain RPC->Stream order write(_phy.getDescriptor(sock), "z", 1); // RPC ACK byte to maintain RPC->Stream order
} }
@ -541,19 +534,19 @@ void NetconEthernetTap::phyOnUnixData(PhySocket *sock,void **uptr,void *data,uns
char padding[] = {0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89}; char padding[] = {0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89};
dwr(MSG_DEBUG," <%x> stream data, len = %d\n", sock, len); dwr(MSG_DEBUG," <%x> stream data, len = %d\n", sock, len);
// Look for padding // Look for padding
std::string padding_pattern(padding, padding+MAGIC_PADDING_SIZE); std::string padding_pattern(padding, padding+CANARY_PADDING_SIZE);
std::string buffer(buf, buf + len); std::string buffer(buf, buf + len);
padding_pos = buffer.find(padding_pattern); padding_pos = buffer.find(padding_pattern);
token_pos = padding_pos-MAGIC_SIZE; token_pos = padding_pos-CANARY_SIZE;
dwr(MSG_DEBUG, " <%x> padding_pos = %d\n", sock, padding_pos); dwr(MSG_DEBUG, " <%x> padding_pos = %d\n", sock, padding_pos);
// Grab token, next we'll use it to look up an RPC job // Grab token, next we'll use it to look up an RPC job
if(token_pos > -1) { if(token_pos > -1) {
memcpy(&magic_num, buf+token_pos, MAGIC_SIZE); memcpy(&CANARY_num, buf+token_pos, CANARY_SIZE);
if(magic_num != 0) { // TODO: Added to address magic_num==0 bug, last seeen 20160108 if(CANARY_num != 0) { // TODO: Added to address CANARY_num==0 bug, last seeen 20160108
// Find job // Find job
sockdata = jobmap[magic_num]; sockdata = jobmap[CANARY_num];
if(!sockdata.first) { // Stream before RPC if(!sockdata.first) { // Stream before RPC
dwr(MSG_DEBUG," <%x> unable to locate job entry for %llu\n", sock, magic_num); dwr(MSG_DEBUG," <%x> unable to locate job entry for %llu\n", sock, CANARY_num);
return; return;
} }
else else
@ -577,7 +570,7 @@ void NetconEthernetTap::phyOnUnixData(PhySocket *sock,void **uptr,void *data,uns
// [TOKEN] + [DATA] // [TOKEN] + [DATA]
if(len > TOKEN_SIZE && token_pos == 0) { if(len > TOKEN_SIZE && token_pos == 0) {
wlen = len - TOKEN_SIZE; wlen = len - TOKEN_SIZE;
data_start = padding_pos+MAGIC_PADDING_SIZE; data_start = padding_pos+CANARY_PADDING_SIZE;
memcpy((&conn->buf)+conn->idx, buf+data_start, wlen); memcpy((&conn->buf)+conn->idx, buf+data_start, wlen);
} }
// [DATA] + [TOKEN] // [DATA] + [TOKEN]
@ -590,9 +583,9 @@ void NetconEthernetTap::phyOnUnixData(PhySocket *sock,void **uptr,void *data,uns
if(len > TOKEN_SIZE && token_pos > 0 && len > (token_pos + TOKEN_SIZE)) { if(len > TOKEN_SIZE && token_pos > 0 && len > (token_pos + TOKEN_SIZE)) {
wlen = len - TOKEN_SIZE; wlen = len - TOKEN_SIZE;
data_start = 0; data_start = 0;
data_end = padding_pos-MAGIC_SIZE; data_end = padding_pos-CANARY_SIZE;
memcpy((&conn->buf)+conn->idx, buf+data_start, (data_end-data_start)+1); memcpy((&conn->buf)+conn->idx, buf+data_start, (data_end-data_start)+1);
memcpy((&conn->buf)+conn->idx, buf+(padding_pos+MAGIC_PADDING_SIZE), len-(token_pos+TOKEN_SIZE)); memcpy((&conn->buf)+conn->idx, buf+(padding_pos+CANARY_PADDING_SIZE), len-(token_pos+TOKEN_SIZE));
} }
} }
} }
@ -614,7 +607,7 @@ void NetconEthernetTap::phyOnUnixData(PhySocket *sock,void **uptr,void *data,uns
// Process RPC if we have a corresponding jobmap entry // Process RPC if we have a corresponding jobmap entry
if(found_job) { if(found_job) {
conn = getConnection(sock); conn = getConnection(sock);
unload_rpc(buf, pid, tid, rpc_count, timestamp, magic, cmd, payload); unload_rpc(buf, pid, tid, rpc_count, timestamp, CANARY, cmd, payload);
switch(cmd) { switch(cmd) {
case RPC_BIND: case RPC_BIND:
dwr(MSG_DEBUG," <%x> RPC_BIND\n", sock); dwr(MSG_DEBUG," <%x> RPC_BIND\n", sock);
@ -644,7 +637,7 @@ void NetconEthernetTap::phyOnUnixData(PhySocket *sock,void **uptr,void *data,uns
break; break;
} }
closeConnection(sockdata.first); // close RPC after sending retval, no longer needed closeConnection(sockdata.first); // close RPC after sending retval, no longer needed
jobmap.erase(magic_num); jobmap.erase(CANARY_num);
return; return;
} }
} }
@ -973,7 +966,7 @@ void NetconEthernetTap::handle_getsockname(PhySocket *sock, PhySocket *rpcsock,
memset(&retmsg, 0, sizeof(retmsg)); memset(&retmsg, 0, sizeof(retmsg));
if ((conn)&&(conn->addr)) if ((conn)&&(conn->addr))
memcpy(&retmsg, conn->addr, sizeof(struct sockaddr_storage)); memcpy(&retmsg, conn->addr, sizeof(struct sockaddr_storage));
int n = write(_phy.getDescriptor(rpcsock), &retmsg, sizeof(struct sockaddr_storage)); write(_phy.getDescriptor(rpcsock), &retmsg, sizeof(struct sockaddr_storage));
} }
/* /*

70
netcon/RPC.c
View File

@ -6,16 +6,21 @@
#include <sys/syscall.h> #include <sys/syscall.h>
#include <fcntl.h> #include <fcntl.h>
#include <dlfcn.h>
#include <stdint.h> #include <stdint.h>
#include <sys/socket.h> #include <sys/socket.h>
#include <strings.h> #include <strings.h>
#include "RPC.h" #include "RPC.h"
#define RPC_FD 1023
#define SERVICE_CONNECT_ATTEMPTS 30 #define SERVICE_CONNECT_ATTEMPTS 30
static int instance_count; #define CONNECT_SIG int __fd, const struct sockaddr * __addr, socklen_t __len
#define SOCKET_SIG int socket_family, int socket_type, int protocol
static int (*realconnect)(CONNECT_SIG) = 0;
static int (*realsocket)(SOCKET_SIG) = 0;
static int rpc_count; static int rpc_count;
static pthread_mutex_t lock; static pthread_mutex_t lock;
@ -63,30 +68,40 @@ int get_retval(int rpc_sock)
return -1; return -1;
} }
int load_symbols_rpc()
{
#ifdef NETCON_INTERCEPT
realsocket = dlsym(RTLD_NEXT, "socket");
realconnect = dlsym(RTLD_NEXT, "connect");
if(!realconnect || !realsocket)
return -1;
#endif
return 1;
}
int rpc_join(const char * sockname) int rpc_join(const char * sockname)
{ {
if(!load_symbols_rpc())
return -1;
struct sockaddr_un addr; struct sockaddr_un addr;
int conn_err = -1, attempts = 0; int conn_err = -1, attempts = 0;
memset(&addr, 0, sizeof(addr)); memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX; addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, sockname, sizeof(addr.sun_path)-1); strncpy(addr.sun_path, sockname, sizeof(addr.sun_path)-1);
int sock; int sock;
if((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0){ if((sock = realsocket(AF_UNIX, SOCK_STREAM, 0)) < 0){
fprintf(stderr, "Error while creating RPC socket\n"); fprintf(stderr, "Error while creating RPC socket\n");
return -1; return -1;
} }
while((conn_err != 0) && (attempts < SERVICE_CONNECT_ATTEMPTS)){ while((conn_err != 0) && (attempts < SERVICE_CONNECT_ATTEMPTS)){
if((conn_err = connect(sock, (struct sockaddr*)&addr, sizeof(addr))) != 0) { if((conn_err = realconnect(sock, (struct sockaddr*)&addr, sizeof(addr))) != 0) {
fprintf(stderr, "Error while connecting to RPC socket. Re-attempting...\n"); fprintf(stderr, "Error while connecting to RPC socket. Re-attempting...\n");
sleep(1); sleep(1);
} }
else { else
//int newfd = dup2(sock, RPC_FD-instance_count);
//close(sock);
return sock; return sock;
}
attempts++; attempts++;
} }
return -1; return -1;
@ -95,36 +110,24 @@ int rpc_join(const char * sockname)
/* /*
* Send a command to the service * Send a command to the service
*/ */
int rpc_send_command(int cmd, int forfd, void *data, int len) int rpc_send_command(char *path, int cmd, int forfd, void *data, int len)
{ {
pthread_mutex_lock(&lock); pthread_mutex_lock(&lock);
char c, padding[] = {0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89}; char c, padding[] = {0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89};
char cmdbuf[BUF_SZ], magic[TOKEN_SIZE], metabuf[BUF_SZ]; char cmdbuf[BUF_SZ], CANARY[TOKEN_SIZE], metabuf[BUF_SZ];
memcpy(magic+MAGIC_SIZE, padding, TOKEN_SIZE); memcpy(CANARY+CANARY_SIZE, padding, TOKEN_SIZE);
uint64_t magic_num; uint64_t canary_num;
// ephemeral RPC socket used only for this command // ephemeral RPC socket used only for this command
int rpc_sock = rpc_join("/root/dev/ztest/nc_e5cd7a9e1c3511dd"); int rpc_sock = rpc_join(path);
// Generate token // Generate token
int fdrand = open("/dev/urandom", O_RDONLY); int fdrand = open("/dev/urandom", O_RDONLY);
read(fdrand, &magic, MAGIC_SIZE); read(fdrand, &CANARY, CANARY_SIZE);
memcpy(&magic_num, magic, MAGIC_SIZE); memcpy(&canary_num, CANARY, CANARY_SIZE);
cmdbuf[CMD_ID_IDX] = cmd; cmdbuf[CMD_ID_IDX] = cmd;
memcpy(&cmdbuf[MAGIC_IDX], &magic_num, MAGIC_SIZE); memcpy(&cmdbuf[CANARY_IDX], &canary_num, CANARY_SIZE);
memcpy(&cmdbuf[STRUCT_IDX], data, len); memcpy(&cmdbuf[STRUCT_IDX], data, len);
// Format: [sig_byte] + [cmd_id] + [magic] + [meta] + [payload]
#ifdef VERBOSE #ifdef VERBOSE
/*
#define IDX_PID 0
#define IDX_TID sizeof(pid_t)
#define IDX_COUNT IDX_TID + sizeof(pid_t)
#define IDX_TIME IDX_COUNT + sizeof(int)
#define IDX_CMD IDX_TIME + 20 // 20 being the length of the timestamp string
#define IDX_PAYLOAD IDX_TIME + sizeof(char)
*/
/* [pid_t] [pid_t] [rpc_count] [int] [...] */
memset(metabuf, 0, BUF_SZ); memset(metabuf, 0, BUF_SZ);
pid_t pid = syscall(SYS_getpid); pid_t pid = syscall(SYS_getpid);
pid_t tid = syscall(SYS_gettid); pid_t tid = syscall(SYS_gettid);
@ -141,7 +144,7 @@ int rpc_send_command(int cmd, int forfd, void *data, int len)
memcpy(&metabuf[IDX_TIME], &timestring, 20 ); /* timestamp */ memcpy(&metabuf[IDX_TIME], &timestring, 20 ); /* timestamp */
#endif #endif
/* Combine command flag+payload with RPC metadata */ /* Combine command flag+payload with RPC metadata */
memcpy(&metabuf[IDX_PAYLOAD], cmdbuf, len + 1 + MAGIC_SIZE); memcpy(&metabuf[IDX_PAYLOAD], cmdbuf, len + 1 + CANARY_SIZE);
// Write RPC // Write RPC
int n_write = write(rpc_sock, &metabuf, BUF_SZ); int n_write = write(rpc_sock, &metabuf, BUF_SZ);
@ -152,7 +155,10 @@ int rpc_send_command(int cmd, int forfd, void *data, int len)
// Write token to corresponding data stream // Write token to corresponding data stream
read(rpc_sock, &c, 1); read(rpc_sock, &c, 1);
if(c == 'z' && n_write > 0 && forfd > -1){ if(c == 'z' && n_write > 0 && forfd > -1){
int w = send(forfd, &magic, TOKEN_SIZE, 0); if(send(forfd, &CANARY, TOKEN_SIZE, 0) < 0) {
fprintf(stderr,"unable to write canary to stream\n");
return -1;
}
} }
// Process response from service // Process response from service
int ret = ERR_OK; int ret = ERR_OK;
@ -263,4 +269,4 @@ ssize_t sock_fd_read(int sock, void *buf, ssize_t bufsize, int *fd)
} }
} }
return size; return size;
} }

27
netcon/RPC.h
View File

@ -3,29 +3,28 @@
#include <stdint.h> #include <stdint.h>
#define MAGIC_SIZE sizeof(uint64_t) #define CANARY_SIZE sizeof(uint64_t)
#define MAGIC_PADDING_SIZE 12 #define CANARY_PADDING_SIZE 12
#define TOKEN_SIZE MAGIC_SIZE+MAGIC_PADDING_SIZE #define TOKEN_SIZE CANARY_SIZE+CANARY_PADDING_SIZE
#define RPC_PHRASE "zerotier\0" #define RPC_PHRASE "zerotier\0"
#define RPC_PHRASE_SIZE 9 #define RPC_PHRASE_SIZE 9
// 1st section // 1st RPC section (metdata)
#define IDX_SIGNAL_PHRASE 0 #define IDX_SIGNAL_PHRASE 0
#define IDX_PID IDX_SIGNAL_PHRASE + RPC_PHRASE_SIZE #define IDX_PID IDX_SIGNAL_PHRASE + RPC_PHRASE_SIZE
#define IDX_TID sizeof(pid_t) + IDX_PID #define IDX_TID sizeof(pid_t) + IDX_PID
#define IDX_COUNT IDX_TID + sizeof(pid_t) #define IDX_COUNT IDX_TID + sizeof(pid_t)
#define IDX_TIME IDX_COUNT + sizeof(int) #define IDX_TIME IDX_COUNT + sizeof(int)
#define IDX_PAYLOAD IDX_TIME + 20 /* 20 being the length of the timestamp string */ #define IDX_PAYLOAD IDX_TIME + 20 /* 20 being the length of the timestamp string */
// 2nd RPC section (payload and canary)
#define CMD_ID_IDX 0
#define CANARY_IDX 1
#define STRUCT_IDX CANARY_IDX+CANARY_SIZE
// 2nd section #define BUF_SZ 256
#define CMD_ID_IDX 0 #define PAYLOAD_SZ 223 /* BUF_SZ-IDX_PAYLOAD */
#define MAGIC_IDX 1
#define STRUCT_IDX MAGIC_IDX+MAGIC_SIZE
#define BUF_SZ 256 #define ERR_OK 0
#define PAYLOAD_SZ 223 /* BUF_SZ-IDX_PAYLOAD */
#define ERR_OK 0
/* RPC codes */ /* RPC codes */
#define RPC_UNDEFINED 0 #define RPC_UNDEFINED 0
@ -54,8 +53,10 @@ extern "C" {
int get_retval(int); int get_retval(int);
//#ifdef NETCON_INTERCEPT
int rpc_join(const char * sockname); int rpc_join(const char * sockname);
int rpc_send_command(int cmd, int forfd, void *data, int len); int rpc_send_command(char *path, int cmd, int forfd, void *data, int len);
//#endif
int get_new_fd(int sock); int get_new_fd(int sock);
ssize_t sock_fd_write(int sock, int fd); ssize_t sock_fd_write(int sock, int fd);

2
netcon/common.inc.c
View File

@ -42,7 +42,7 @@
#ifndef _COMMON_H #ifndef _COMMON_H
#define _COMMON_H 1 #define _COMMON_H 1
#define DEBUG_LEVEL 0 #define DEBUG_LEVEL 3
#define MSG_WARNING 4 #define MSG_WARNING 4
#define MSG_ERROR 1 // Errors #define MSG_ERROR 1 // Errors