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client.c
481 lines (390 loc) · 9.99 KB
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client.c
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#include "tunnel.h"
#include "client.h"
#include "socket_comm.h"
#include "sys/time.h"
#include <assert.h>
struct client {
char remote_ip[128];
int remote_port;
int ssh_port;
int free_connection;
int id_idx;
struct ring_buffer* wait_closed;
int max_fd;
fd_set fd_rset;
fd_set fd_wset;
int time;
int cnt;
struct client_info all_fds[TOTAL_CONNECTION];
int all_ids[TOTAL_CONNECTION];
};
static int
get_id(struct client* c) {
int i, ret = -1;
for (i = c->id_idx; i < c->id_idx + TOTAL_CONNECTION; ++i) {
int idx = i % TOTAL_CONNECTION;
++c->id_idx;
if (c->all_fds[idx].fd == 0) {
ret = i;
break;
}
}
return ret;
}
static int
connect_to(struct client* c, int ssh_id){
if (c->cnt >= TOTAL_CONNECTION) {
fprintf(stderr, "%s client max connection.....\n", get_time());
return -1;
}
const char* ip;
int port;
if (ssh_id < 0) {
if (c->free_connection > 0) return -1;
struct timeval tv;
gettimeofday(&tv, NULL);
if (tv.tv_sec - c->time < FREE_CONNECT_TIME) {
return -1;
}else {
c->time = tv.tv_sec;
}
ip = c->remote_ip;
port = c->remote_port;
} else {
ip = "0.0.0.0";
port = c->ssh_port;
}
int id;
int idx;
struct client_info* info;
struct ring_buffer* rb;
struct addrinfo hints;
struct addrinfo* res = NULL;
struct addrinfo* ai_ptr = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
char portstr[16];
sprintf(portstr, "%d", port);
int status = getaddrinfo(ip, portstr, &hints, &res);
if (status != 0) {
return -1;
}
int sock = -1;
for (ai_ptr = res; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) {
sock = socket(ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
if (sock < 0) {
continue;
}
set_keep_alive(sock);
sp_nonblocking(sock);
status = connect(sock, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
if (status != 0 && errno != EINPROGRESS) {
close(sock);
sock = -1;
continue;
}
break;
}
if (sock < 0) {
goto _failed;
}
id = get_id(c);
assert(id != -1);
idx = id % TOTAL_CONNECTION;
info = &c->all_fds[idx];
info->fd = sock;
info->id = id;
info->to_id = ssh_id;
snprintf(info->client_ip, sizeof(info->client_ip), "%s:%d", ip, port);
rb = alloc_ring_buffer(MAX_CLIENT_BUFFER);
info->buffer = rb;
c->all_ids[c->cnt++] = id;
if (ssh_id < 0) {
c->free_connection += 1;
}
if (status != 0) {
//connect no block, need check after
FD_SET(sock, &c->fd_wset);
info->connect_type = SOCKET_CONNECTING;
}else {
//success
FD_SET(sock, &c->fd_rset);
info->connect_type = SOCKET_CONNECTED;
struct sockaddr* addr = ai_ptr->ai_addr;
void* sin_addr = (ai_ptr->ai_family == AF_INET) ? (void*)&((struct sockaddr_in*)addr)->sin_addr : (void*)&((struct sockaddr_in6*)addr)->sin6_addr;
inet_ntop(ai_ptr->ai_family, sin_addr, info->client_ip, sizeof(info->client_ip));
fprintf(stderr, "%s connected to %s. \n", get_time(), info->client_ip);
}
if (c->max_fd < sock + 1) {
c->max_fd = sock + 1;
}
return id;
_failed:
freeaddrinfo(res);
return -1;
}
static void
do_close(struct client* c, struct client_info* info) {
int i;
for (i = 0; i < c->cnt; ++i) {
if (c->all_ids[i] == info->id) {
memcpy(c->all_ids + i, c->all_ids + i + 1, (c->cnt - i - 1) * sizeof(int));
--c->cnt;
break;
}
}
FD_CLR(info->fd, &c->fd_rset);
FD_CLR(info->fd, &c->fd_wset);
close(info->fd);
if (info->to_id == -1) {
assert(c->free_connection == 1);
c->free_connection = 0;
}
if (info->to_id >= 0 && c->all_fds[info->to_id % TOTAL_CONNECTION].id == info->to_id ) {
int len;
char* id_buffer = get_ring_buffer_write_ptr(c->wait_closed, &len);
int id_len = sizeof(int);
assert(id_buffer && len >= id_len);
memcpy(id_buffer, &info->to_id, id_len);
move_ring_buffer_write_pos(c->wait_closed, id_len);
}
if (info->connect_type == SOCKET_CONNECTED)
{
fprintf(stderr, "%s client disconnect from %s.\n", get_time(), info->client_ip);
}
info->to_id = -1;
info->id = -1;
info->fd = 0;
info->connect_type = 0;
free_ring_buffer(info->buffer);
info->buffer = NULL;
memset(info->client_ip, 0, sizeof(info->client_ip));
}
static int
report_connect(struct client* c, struct client_info* info) {
int error;
socklen_t len = sizeof(error);
int code = getsockopt(info->fd, SOL_SOCKET, SO_ERROR, &error, &len);
if (code != 0 || error != 0) {
//connect fail, close it
fprintf(stderr, "%s client: connect to %s error :%s. \n", get_time(), info->client_ip, strerror(error));
do_close(c, info);
return -1;
}
info->connect_type = SOCKET_CONNECTED;
FD_SET(info->fd, &c->fd_rset);
union sockaddr_all u;
socklen_t slen = sizeof(u);
if (getpeername(info->fd, &u.s, &slen) == 0){
void* sin_addr = (u.s.sa_family == AF_INET) ? (void*)&u.v4.sin_addr : (void*)&u.v6.sin6_addr;
inet_ntop(u.s.sa_family, sin_addr, info->client_ip, sizeof(info->client_ip));
}
fprintf(stderr, "%s connected to %s. \n", get_time(), info->client_ip);
return 0;
}
static int
do_read(struct client* c, struct client_info* info) {
assert(info->connect_type == SOCKET_CONNECTED);
int to_id = info->to_id;
if (to_id < 0) {
to_id = connect_to(c, info->id);
if (to_id == -1) {
do_close(c, info);
return -1;
}
info->to_id = to_id;
c->free_connection -= 1;
c->time = 0;
}
int len;
struct client_info* to_info = &c->all_fds[to_id % TOTAL_CONNECTION];
if (to_info->id != to_id) {
do_close(c, info);
return -1;
}
char* buffer = get_ring_buffer_write_ptr(to_info->buffer, &len);
if (!buffer) {
return 0; //buff fulled
}
int n = (int)read(info->fd, buffer, len);
if (n == -1) {
switch (errno) {
case EAGAIN:
fprintf(stderr, "%s read fd error:EAGAIN.\n", get_time());
break;
case EINTR:
break;
default:
fprintf(stderr, "%s client: read (id=%d) error :%s. \n", get_time(), info->id, strerror(errno));
do_close(c, info);
return -1;
}
return 1;
}
if (n == 0) {
do_close(c, info); //normal close
return -1;
}
move_ring_buffer_write_pos(to_info->buffer, n);
FD_SET(to_info->fd, &c->fd_wset);
if (n == len && !is_ring_buffer_empty(to_info->buffer)) {
fprintf(stderr, "%s client: read again.\n", get_time());
return do_read(c, info);
}
return 1;
}
static int
do_write(struct client* c, struct client_info* info, int wait_closed) {
if (info->connect_type == SOCKET_CONNECTING) {
if (wait_closed) return 0;
if (report_connect(c, info) == -1) {
return -1;
}else if (is_ring_buffer_empty(info->buffer)) {
FD_CLR(info->fd, &c->fd_wset);
}
return 0;
}
int len;
char* buffer = get_ring_buffer_read_ptr(info->buffer, &len);
if (!buffer) {
return 0;
}
int writed_len = 0;
char need_break = 0;
while (!need_break && writed_len < len) {
int n = write(info->fd, buffer, len - writed_len);
if (n < 0) {
switch (errno) {
case EINTR:
n = 0;
break;
case EAGAIN:
n = 0;
need_break = 1;
break;
default:
need_break = 1;
fprintf(stderr, "%s socket-client: write to (id=%d) error :%s.\n", get_time(), info->id, strerror(errno));
do_close(c, info);
return -1;
}
}
else {
writed_len += n;
buffer += n;
}
}
move_ring_buffer_read_pos(info->buffer, writed_len);
if (is_ring_buffer_empty(info->buffer)) {
FD_CLR(info->fd, &c->fd_wset);
} else if (writed_len == len) {
fprintf(stderr, "%s client: write again.\n", get_time());
return do_write(c, info, wait_closed);
}
return 1;
}
static void
pre_check_close(struct client* c) {
int len;
char* id_buffer = get_ring_buffer_read_ptr(c->wait_closed, &len);
if (!id_buffer) return;
int id_len = sizeof(int);
assert(len % id_len == 0);
int tmp = len;
while (len > 0) {
int* id = (int*)id_buffer;
int idx = *id % TOTAL_CONNECTION;
id_buffer += id_len;
len -= len;
struct client_info* info = c->all_fds + idx;
if (info->fd > 0 && info->id == *id) {
if (do_write(c, info, 1) != -1) {
do_close(c, info);
}
}
}
move_ring_buffer_read_pos(c->wait_closed, tmp);
}
static void*
client_thread(void* param) {
struct client_param* cp = (struct client_param*)param;
struct client c;
memset(&c, 0, sizeof(c));
sprintf(c.remote_ip, "%s", cp->remote_ip);
c.remote_port = cp->p1;
c.ssh_port = cp->p2;
c.wait_closed = alloc_ring_buffer(sizeof(int) * TOTAL_CONNECTION);
FD_ZERO(&c.fd_rset);
FD_ZERO(&c.fd_wset);
FD_SET(cp->pid, &c.fd_rset);
c.max_fd = cp->pid + 1;
sp_nonblocking(cp->pid);
while (1) {
pre_check_close(&c);
if (connect_to(&c, -1) == -1 && c.cnt == 0) {
c.max_fd = cp->pid + 1;
int buff = 0;
int n = (int)read(cp->pid, &buff, sizeof(int));
if (n > 0) {
break;
}
sleep(1);
continue;
}
fd_set r_set = c.fd_rset;
fd_set w_set = c.fd_wset;
int cnt = select(c.max_fd, &r_set, &w_set, NULL, NULL);
if (cnt == -1) {
fprintf(stderr, "%s select error: %s.\n", get_time(), strerror(errno));
continue;
}
int i;
for (i = c.cnt - 1; i >= 0 && cnt > 0; --i) {
int id = c.all_ids[i] % TOTAL_CONNECTION;
struct client_info* info = &c.all_fds[id];
assert(c.all_ids[i] == info->id);
int fd = info->fd;
assert(fd > 0);
if (FD_ISSET(fd, &r_set)) {
// read
--cnt;
if (do_read(&c, info) == -1) continue;
}
if (FD_ISSET(fd, &w_set)) {
//write
--cnt;
if (do_write(&c, info, 0) == -1) continue;
}
}
if (FD_ISSET(cp->pid, &r_set)) {
//exit
break;
}
}
fprintf(stderr, "%s ====================CLIENT: SEND LAST DATA BEGIN===================.\n", get_time());
int i;
for (i = c.cnt - 1; i >= 0; --i) {
int id = c.all_ids[i] % TOTAL_CONNECTION;
struct client_info* info = &c.all_fds[id];
assert(c.all_ids[i] == info->id);
if (do_write(&c, info, 1) != -1) {
do_close(&c, info);
}
}
fprintf(stderr, "%s ====================CLIENT: SEND LAST DATA END=====================.\n", get_time());
free_ring_buffer(c.wait_closed);
assert(c.cnt == 0);
return NULL;
}
pthread_t
start_client(struct client_param* cp) {
pthread_t pid;
if (pthread_create(&pid, NULL, client_thread, cp)) {
fprintf(stderr, "%s Create client thread failed.\n", get_time());
exit(1);
return 0;
}
return pid;
}