static int socks5_src_choose_auth_method(struct sserver_handle *handle, struct ssession *session) {
// 1. parse
// 2. clear buf;
// 3. add response to sendbuf;
// 4. add fd to writefds
// 5. set session state to SSESSION_STATE_CONNECT
char ver = 0;
char nmethod = 0;
char selmethod = 0x00;
char methods[256] = {0x00};
int nread = 0;
struct ringbuffer_tran tran;
struct ringbuffer *tranrb = NULL;
tranrb = ringbuffer_transaction_begin(session->dstbuf, &tran);
nread = ringbuffer_transaction_read(tranrb, &ver, 1);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
if(ver != 0x5) {
return SE_UNSUPPORT_VERSION;
}
nread = ringbuffer_transaction_read(tranrb, &nmethod, 1);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
if(nmethod == 0) {
return SE_NO_METHOD;
}
nread = ringbuffer_transaction_read(tranrb, &methods, nmethod);
if(nread <= 0 && nread != (int) nmethod) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
ringbuffer_clear(session->dstbuf);
ringbuffer_write(session->srcbuf, &ver, 1);
ringbuffer_write(session->srcbuf, &selmethod, 1);
FD_SET(session->srcfd, &handle->server->writefds);
session->state = SSESSION_STATE_CONNECT;
return 0;
}
int
ringbuffer_init(RingBuffer **rb, int size, size_t elem_size)
{
void *ptr =NULL;
ptr = calloc(1, sizeof(RingBuffer) + (size * elem_size));
if (ptr) {
RingBuffer *buf = ptr;
pthread_mutex_init(&buf->lock, 0);
pthread_cond_init(&buf->cond, 0);
buf->size = size;
buf->elems = buf + 1;
buf->elem_size = elem_size;
ringbuffer_clear(buf);
buf->dump = no_dump;
buf->dump_ud = NULL;
*rb = buf;
return 0;
}
return -1;
}
int main(int argc, char **argv) {
// For connect/authenticate failures
int reconnect_delay = 1;
// RingBuffer buffer for the writer
char *writer_buffer = 0;
LINFO("%s starting", APP_NAME);
config_init(argc > 1 ? argv[1] : 0);
pthread_create(&config.timer_thread.thread, 0, timer_thread_entry, (void *)&config.timer_thread);
if (!config_read()) {
return 1;
}
load_data();
sighelper_sigaction(SIGHUP, reload_config);
sighelper_sigaction(SIGUSR1, save_data);
sighelper_sigaction(SIGTERM, terminate);
sighelper_sigaction(SIGQUIT, terminate);
sighelper_sigaction(SIGINT, terminate);
LDEBUG("allocating writer buffer, size %d", config.writer.buffer);
writer_buffer = malloc(config.writer.buffer);
ringbuffer_init(&config.writer_thread.ringbuffer,
writer_buffer, config.writer.buffer);
LDEBUG("creating reader queue, size %d", config.reader.queue);
queue_init(&config.reader_thread.queue, config.reader.queue);
while (running) {
LINFO("connecting to %s:%d", config.network.host, config.network.port);
if (net_connect(&config.socket, config.network.host, config.network.port)) {
LINFO("opening XMPP stream to %s", config.component.hostname);
if (!net_stream(&config.socket,
"xmcomp",
config.component.hostname,
config.component.password)) {
net_disconnect(&config.socket);
}
}
if (!config.socket.connected) {
LERROR("retrying in %d second(s)", reconnect_delay);
sleep(reconnect_delay);
if (reconnect_delay < 60) {
reconnect_delay <<= 1;
}
continue;
}
reconnect_delay = 1;
LINFO("creating writer thread");
config.writer_thread.socket = &config.socket;
config.writer_thread.enabled = TRUE;
pthread_create(&config.writer_thread.thread, 0, writer_thread_entry, (void *)&config.writer_thread);
LINFO("creating reader thread");
config.reader_thread.socket = &config.socket;
config.reader_thread.enabled = TRUE;
pthread_create(&config.reader_thread.thread, 0, reader_thread_entry, (void *)&config.reader_thread);
LINFO("creating worker threads");
config_apply();
LINFO("started");
LDEBUG("joining reader thread");
pthread_join(config.reader_thread.thread, 0);
// Switch ringbuffer to offline, indicating no more data is expected.
// As soon as the writer finishes the job, it will terminate
ringbuffer_offline(&config.writer_thread.ringbuffer);
LDEBUG("joining writer thread");
pthread_join(config.writer_thread.thread, 0);
LINFO("clearing output buffer and disconnecting");
ringbuffer_clear(&config.writer_thread.ringbuffer);
net_unstream(&config.socket);
net_disconnect(&config.socket);
}
LINFO("cleaning up");
ringbuffer_destroy(&config.writer_thread.ringbuffer);
queue_destroy(&config.reader_thread.queue);
free(writer_buffer);
config_destroy();
return 0;
}
void ioreset()
{
ringbuffer_clear(&ringbuffer);
}
static int socks5_src_do_connect(struct sserver_handle *handle, struct ssession *session) {
// 1. parse
// 2. clear buf;
// 3. connect to dest addr
// 4. set session.dstfd
// 5. add response to sendbuf;
// 6. add fd to writefds
// 7. set session state to SSESSION_STATE_TRANSMIT
/*
rep:
0x00 成功
0x01 一般性失败
0x02 规则不允许转发
0x03 网络不可达
0x04 主机不可达
0x05 连接拒绝
0x06 TTL超时
0x07 不支持请求包中的CMD
0x08 不支持请求包中的ATYP
0x09-0xFF unassigned
*/
int ret = 0;
char ver = 0x00;
char cmd = 0x00;
char rsv = 0x00;
char atyp = 0x00;
char ndstaddr = 0x00;
uint32_t ip = 0x00;
char dstaddr[256] = {0x00};
uint16_t dstport = 0;
char rep = 0x00;
char nbndaddr = 0x00;
char bndaddr[256] = {0x00};
uint16_t bndport = 0;
int nread = 0;
struct ringbuffer_tran tran;
struct ringbuffer *tranrb = NULL;
tranrb = ringbuffer_transaction_begin(session->dstbuf, &tran);
nread = ringbuffer_transaction_read(tranrb, &ver, 1);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
nread = ringbuffer_transaction_read(tranrb, &cmd, 1);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
nread = ringbuffer_transaction_read(tranrb, &rsv, 1);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
nread = ringbuffer_transaction_read(tranrb, &atyp, 1);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
switch (cmd) {
case 0x01:
break;
case 0x02:
case 0x03:
default:
rep = 0x07;
goto pre_send;
break;
}
switch(atyp) {
case 0x01: // ipv4
nread = ringbuffer_transaction_read(tranrb, &ip, 4);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
nread = ringbuffer_transaction_read(tranrb, &dstport, 2);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
session->dstfd = tcp_socket_connect_with_ip(ip, dstport);
break;
case 0x03: // domain
nread = ringbuffer_transaction_read(tranrb, &ndstaddr, 1);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
nread = ringbuffer_transaction_read(tranrb, dstaddr, ndstaddr);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
nread = ringbuffer_transaction_read(tranrb, &dstport, 2);
if(nread <= 0) {
ringbuffer_transaction_rollback(session->dstbuf, &tran);
return SE_NEEDMORE;
}
session->dstfd = tcp_socket_connect_with_domain(dstaddr, dstport);
break;
case 0x04: // ipv6
rep = 0x08;
goto pre_send;
break;
}
if(session->dstfd < 0) {
switch (errno) {
case ENETUNREACH:
rep = 0x03;
break;
case EHOSTUNREACH:
rep = 0x04;
break;
case ECONNREFUSED:
rep = 0x05;
break;
default:
rep = 0x01;
break;
}
} else {
FD_SET(session->dstfd, &handle->server->readfds);
if(handle->server->maxfd < session->dstfd)
handle->server->maxfd = session->dstfd;
}
pre_send:
atyp = 0x01;
nbndaddr = 4;
bndaddr[0] = '\0';
bndaddr[1] = '\0';
bndaddr[2] = '\0';
bndaddr[3] = '\0';
ringbuffer_clear(session->dstbuf);
ringbuffer_write(session->srcbuf, &ver, 1);
ringbuffer_write(session->srcbuf, &rep, 1);
ringbuffer_write(session->srcbuf, &rsv, 1);
ringbuffer_write(session->srcbuf, &atyp, 1);
ringbuffer_write(session->srcbuf, &nbndaddr, 1);
ringbuffer_write(session->srcbuf, bndaddr, nbndaddr);
ringbuffer_write(session->srcbuf, &bndport, 2);
FD_SET(session->srcfd, &handle->server->writefds);
if(handle->server->maxfd < session->srcfd)
handle->server->maxfd = session->srcfd;
session->state = SSESSION_STATE_TRANSMIT;
return ret;
}
/// "destructor", free up a ringbuffer_t's resources after you're done
void ringbuffer_done(ringbuffer_t *rb) {
ringbuffer_clear(rb);
rb->capacity = 0;
free(rb->entries);
rb->entries = NULL;
}