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shadowsocks-libev
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refine server

pull/4/merge
Max Lv 11 years ago
parent
68f31592d9
commit
68f43414cc
1 changed files with 120 additions and 106 deletions
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  1. 226
      server.c

226
server.c
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@ -97,6 +97,7 @@ struct remote *connect_to_remote(char *remote_host, char *remote_port, struct ti
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
int err = getaddrinfo(remote_host, remote_port, &hints, &res);
if (err) {
perror("getaddrinfo");
@ -146,119 +147,125 @@ static void server_recv_cb (EV_P_ ev_io *w, int revents) {
buf_len = &remote->buf_len;
}
ssize_t r = recv(server->fd, buf, BUF_SIZE, 0);
while (1) {
if (r == 0) {
// connection closed
*buf_len = 0;
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
} else if(r < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
// no data
// continue to wait for recv
return;
} else {
perror("server recv");
ssize_t r = recv(server->fd, buf, BUF_SIZE, 0);
if (r == 0) {
// connection closed
*buf_len = 0;
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
} else if(r < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
// no data
// continue to wait for recv
return;
} else {
perror("server recv");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
}
}
decrypt_ctx(buf, r, server->d_ctx);
// handshake and transmit data
if (server->stage == 5) {
int w = send(remote->fd, remote->buf, r, 0);
if(w == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
// no data, wait for send
remote->buf_len = r;
decrypt_ctx(buf, r, server->d_ctx);
// handshake and transmit data
if (server->stage == 5) {
int w = send(remote->fd, remote->buf, r, 0);
if(w == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
// no data, wait for send
remote->buf_len = r;
ev_io_stop(EV_A_ &server_recv_ctx->io);
ev_io_start(EV_A_ &remote->send_ctx->io);
return;
} else {
perror("server_recv_send");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
} else if(w < r) {
char *pt = remote->buf;
char *et = pt + r;
while (pt + w < et) {
*pt = *(pt + w);
pt++;
}
remote->buf_len = r - w;
assert(remote->buf_len >= 0);
ev_io_stop(EV_A_ &server_recv_ctx->io);
ev_io_start(EV_A_ &remote->send_ctx->io);
return;
}
} else if (server->stage == 0) {
/*
* Shadowsocks Protocol:
*
* +------+----------+----------+
* | ATYP | DST.ADDR | DST.PORT |
* +------+----------+----------+
* | 1 | Variable | 2 |
* +------+----------+----------+
*/
int offset = 0;
char atyp = server->buf[offset++];
char host[256];
memset(host, 0, 256);
int port = 0;
// get remote addr and port
if (atyp == 1) {
// IP V4
size_t in_addr_len = sizeof(struct in_addr);
char *a = inet_ntoa(*(struct in_addr*)(server->buf + offset));
memcpy(host, a, strlen(a));
offset += in_addr_len;
} else if (atyp == 3) {
// Domain name
uint8_t name_len = *(uint8_t *)(server->buf + offset);
memcpy(host, server->buf + offset + 1, name_len);
offset += name_len + 1;
} else {
perror("server_recv_send");
LOGE("unsupported addrtype: %d\n", atyp);
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
} else if(w < r) {
char *pt = remote->buf;
char *et = pt + r;
while (pt + w < et) {
*pt = *(pt + w);
pt++;
}
remote->buf_len = r - w;
assert(remote->buf_len >= 0);
ev_io_stop(EV_A_ &server_recv_ctx->io);
ev_io_start(EV_A_ &remote->send_ctx->io);
return;
}
} else if (server->stage == 0) {
/*
* Shadowsocks Protocol:
*
* +------+----------+----------+
* | ATYP | DST.ADDR | DST.PORT |
* +------+----------+----------+
* | 1 | Variable | 2 |
* +------+----------+----------+
*/
int offset = 0;
char atyp = server->buf[offset++];
char host[256];
memset(host, 0, 256);
int port = 0;
// get remote addr and port
if (atyp == 1) {
// IP V4
size_t in_addr_len = sizeof(struct in_addr);
char *a = inet_ntoa(*(struct in_addr*)(server->buf + offset));
memcpy(host, a, strlen(a));
offset += in_addr_len;
} else if (atyp == 3) {
// Domain name
uint8_t name_len = *(uint8_t *)(server->buf + offset);
memcpy(host, server->buf + offset + 1, name_len);
offset += name_len + 1;
} else {
LOGE("unsupported addrtype: %d\n", atyp);
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
port += *(uint8_t *)(server->buf + offset++) << 8;
port += *(uint8_t *)(server->buf + offset);
port += *(uint8_t *)(server->buf + offset++) << 8;
port += *(uint8_t *)(server->buf + offset);
if (verbose) {
LOGD("connect to: %s:%s\n", host, itoa(port));
}
if (verbose) {
LOGD("connect to: %s:%s\n", host, itoa(port));
}
struct remote *remote = connect_to_remote(host, itoa(port), server->timeout);
if (remote == NULL) {
close_and_free_server(EV_A_ server);
return;
}
struct remote *remote = connect_to_remote(host, itoa(port), server->timeout);
if (remote == NULL) {
close_and_free_server(EV_A_ server);
return;
}
// listen to remote connected event
ev_io_stop(EV_A_ &server->recv_ctx->io);
ev_io_start(EV_A_ &remote->send_ctx->io);
ev_timer_start(EV_A_ &remote->send_ctx->watcher);
// listen to remote connected event
ev_io_stop(EV_A_ &server->recv_ctx->io);
ev_io_start(EV_A_ &remote->send_ctx->io);
ev_timer_start(EV_A_ &remote->send_ctx->watcher);
remote->server = server;
server->remote = remote;
remote->server = server;
server->remote = remote;
server->buf_len = 0;
server->stage = 5;
server->stage = 5;
return;
}
}
}
@ -300,6 +307,7 @@ static void server_send_cb (EV_P_ ev_io *w, int revents) {
if (remote != NULL) {
ev_io_start(EV_A_ &remote->recv_ctx->io);
} else {
LOGE("invalid remote.");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
@ -319,10 +327,6 @@ static void remote_timeout_cb(EV_P_ ev_timer *watcher, int revents) {
ev_timer_stop(EV_A_ watcher);
if (server == NULL) {
close_and_free_remote(EV_A_ remote);
return;
}
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
}
@ -332,10 +336,13 @@ static void remote_recv_cb (EV_P_ ev_io *w, int revents) {
struct remote *remote = remote_recv_ctx->remote;
struct server *server = remote->server;
if (server == NULL) {
LOGE("invalid server.\n");
close_and_free_remote(EV_A_ remote);
return;
}
while (1) {
ssize_t r = recv(remote->fd, server->buf, BUF_SIZE, 0);
if (r == 0) {
@ -348,7 +355,7 @@ static void remote_recv_cb (EV_P_ ev_io *w, int revents) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
// no data
// continue to wait for recv
break;
return;
} else {
perror("remote recv");
close_and_free_remote(EV_A_ remote);
@ -356,33 +363,34 @@ static void remote_recv_cb (EV_P_ ev_io *w, int revents) {
return;
}
}
encrypt_ctx(server->buf, r, server->e_ctx);
int w = send(server->fd, server->buf, r, 0);
if(w == -1) {
int s = send(server->fd, server->buf, r, 0);
if (s == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
// no data, wait for send
server->buf_len = r;
ev_io_stop(EV_A_ &remote_recv_ctx->io);
ev_io_start(EV_A_ &server->send_ctx->io);
break;
} else {
perror("remote_recv_send");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;
}
} else if(w < r) {
return;
} else if (s < r) {
char *pt = server->buf;
char *et = pt + r;
while (pt + w < et) {
*pt = *(pt + w);
while (pt + s < et) {
*pt = *(pt + s);
pt++;
}
server->buf_len = r - w;
server->buf_len = r - s;
assert(server->buf_len >= 0);
ev_io_stop(EV_A_ &remote_recv_ctx->io);
ev_io_start(EV_A_ &server->send_ctx->io);
break;
return;
}
}
}
@ -398,10 +406,15 @@ static void remote_send_cb (EV_P_ ev_io *w, int revents) {
socklen_t len = sizeof addr;
int r = getpeername(remote->fd, (struct sockaddr*)&addr, &len);
if (r == 0) {
if (verbose) {
LOGD("remote connected.\n");
}
remote_send_ctx->connected = 1;
ev_io_stop(EV_A_ &remote_send_ctx->io);
ev_timer_stop(EV_A_ &remote_send_ctx->watcher);
ev_io_start(EV_A_ &server->recv_ctx->io);
//ev_io_stop(EV_A_ &server->send_ctx->io);
ev_io_start(EV_A_ &remote->recv_ctx->io);
return;
} else {
@ -447,6 +460,7 @@ static void remote_send_cb (EV_P_ ev_io *w, int revents) {
if (server != NULL) {
ev_io_start(EV_A_ &server->recv_ctx->io);
} else {
LOGE("invalid server.\n");
close_and_free_remote(EV_A_ remote);
close_and_free_server(EV_A_ server);
return;

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