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common.c
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/*
* Copyright (c) 2014 Zhao, Gang <[email protected]>
* This is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See COPYING for details.
*/
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <netdb.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <openssl/evp.h>
#include <openssl/bio.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "log.h"
#include "common.h"
static bool daemonize;
int nfds = DEFAULT_MAX_CONNECTION;
struct pollfd *clients;
struct ss_option ss_opt;
struct link **link_head;
static void usage_client(const char *name)
{
pr_err("Usage: %s [options]\n"
"Options:\n"
"\t-s,--server_addr server address\n"
"\t-p,--server_port server port\n"
"\t-u,--local_addr\t local Used address\n"
"\t-b,--local_port\t local Binding port\n"
"\t-k,--password\t your password\n"
"\t-m,--method\t encryption algorithm(aes-*-cfb, bf-cfb, cast5-cfb, des-cfb, rc2-cfb, rc4, seed-cfb)\n"
"\t-d,--daemon\t run as daemon\n"
"\t-l,--log_level\t log level(0-7), default is LOG_NOTICE\n"
"\t-h,--help\t print this help\n", name);
}
static void usage_server(const char *name)
{
pr_err("Usage: %s [options]\n"
"Options:\n"
"\t-u,--local_addr\t local address\n"
"\t-b,--local_port\t local port\n"
"\t-k,--password\t your password\n"
"\t-m,--method\t encryption algorithm\n"
"\t-d,--daemon\t run as daemon\n"
"\t-l,--log_level\t log level(0-7), default is LOG_NOTICE\n"
"\t-h,--help\t print this help information\n", name);
}
static void pr_ss_option(const char *type)
{
char *server = NULL;
char *server_port = NULL;
if (strcmp(type, "client") == 0) {
server = ss_opt.server_addr;
server_port = ss_opt.server_port;
}
pr_info("Options:\n"
"server address: %s, server port: %s\n"
"local address: %s, local port: %s\n"
"password: %s\n"
"method: %s\n",
server, server_port,
ss_opt.local_addr, ss_opt.local_port,
ss_opt.password, ss_opt.method);
}
static void parse_cmdline(int argc, char **argv, const char *type)
{
int len, opt;
int log_opt = LOG_CONS | LOG_PERROR;
int level = -1;
char missing[128] = "";
struct option *longopts;
const char *optstring;
void (*usage)(const char *name);
struct option server_long_options[] = {
{"local_addr", required_argument, 0, 'u'},
{"local_port", required_argument, 0, 'b'},
{"password", required_argument, 0, 'k'},
{"method", required_argument, 0, 'm'},
{"daemon", no_argument, 0, 'd'},
{"log_level", no_argument, 0, 'l'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0}
};
struct option client_long_options[] = {
{"server_addr", required_argument, 0, 's'},
{"server_port", required_argument, 0, 'p'},
{"local_addr", required_argument, 0, 'u'},
{"local_port", required_argument, 0, 'b'},
{"password", required_argument, 0, 'k'},
{"method", required_argument, 0, 'm'},
{"daemon", no_argument, 0, 'd'},
{"log_level", no_argument, 0, 'l'},
{"log_stderr", no_argument, 0, 'L'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0}
};
if (strcmp(type, "client") == 0) {
longopts = client_long_options;
optstring = "s:p:u:b:k:m:dl:h";
usage = usage_client;
openlog("sslocal", log_opt, LOG_DAEMON);
} else if (strcmp(type, "server") == 0) {
longopts = server_long_options;
optstring = "u:b:k:m:dl:h";
usage = usage_server;
openlog("sserver", log_opt, LOG_DAEMON);
} else {
openlog("shadowsocks", log_opt, LOG_DAEMON);
pr_exit("%s: unknown type\n", __func__);
}
while (1) {
opt = getopt_long(argc, argv, optstring, longopts, NULL);
if (opt == -1)
break;
switch (opt) {
case 's':
if (strcmp(type, "server") == 0) {
pr_warn("%s: server doesn't need -s option\n",
__func__);
break;
}
len = strlen(optarg);
if (len <= MAX_DOMAIN_LEN) {
strcpy(ss_opt.server_addr, optarg);
} else {
strncpy(ss_opt.server_addr, optarg,
MAX_DOMAIN_LEN);
ss_opt.server_addr[MAX_DOMAIN_LEN] = '\0';
}
break;
case 'p':
if (strcmp(type, "server") == 0) {
pr_warn("%s: server doesn't need -p option\n",
__func__);
break;
}
len = strlen(optarg);
if (len <= MAX_PORT_STRING_LEN) {
strcpy(ss_opt.server_port, optarg);
} else {
strncpy(ss_opt.server_port, optarg,
MAX_PORT_STRING_LEN);
ss_opt.server_port[MAX_PORT_STRING_LEN] = '\0';
}
break;
case 'u':
len = strlen(optarg);
if (len <= MAX_DOMAIN_LEN) {
strcpy(ss_opt.local_addr, optarg);
} else {
strncpy(ss_opt.local_addr, optarg,
MAX_DOMAIN_LEN);
ss_opt.local_addr[MAX_DOMAIN_LEN] = '\0';
}
break;
case 'b':
len = strlen(optarg);
if (len <= MAX_PORT_STRING_LEN) {
strcpy(ss_opt.local_port, optarg);
} else {
strncpy(ss_opt.local_port, optarg,
MAX_PORT_STRING_LEN);
ss_opt.local_port[MAX_PORT_STRING_LEN] = '\0';
}
break;
case 'k':
len = strlen(optarg);
if (len <= MAX_PWD_LEN) {
strcpy(ss_opt.password, optarg);
} else {
strncpy(ss_opt.password, optarg,
MAX_PWD_LEN);
ss_opt.password[MAX_PWD_LEN] = '\0';
}
break;
case 'm':
len = strlen(optarg);
if (len <= MAX_METHOD_NAME_LEN) {
strcpy(ss_opt.method, optarg);
} else {
strncpy(ss_opt.method, optarg,
MAX_METHOD_NAME_LEN);
ss_opt.method[MAX_METHOD_NAME_LEN] = '\0';
}
break;
case 'd':
daemonize = true;
log_opt &= ~LOG_PERROR;
break;
case 'l':
if (strcmp(optarg, "0") == 0)
level = LOG_EMERG;
else if (strcmp(optarg, "1") == 0)
level = LOG_ALERT;
else if (strcmp(optarg, "2") == 0)
level = LOG_CRIT;
else if (strcmp(optarg, "3") == 0)
level = LOG_ERR;
else if (strcmp(optarg, "4") == 0)
level = LOG_WARNING;
else if (strcmp(optarg, "5") == 0)
level = LOG_NOTICE;
else if (strcmp(optarg, "6") == 0)
level = LOG_INFO;
else if (strcmp(optarg, "7") == 0)
level = LOG_DEBUG;
else
level = LOG_NOTICE;
break;
case 'h':
usage(argv[0]);
exit(EXIT_SUCCESS);
case '?':
usage(argv[0]);
exit(EXIT_FAILURE);
}
}
if (strcmp(type, "client") == 0) {
if (strlen(ss_opt.server_addr) == 0)
strcat(missing, "-s ");
if (strlen(ss_opt.server_port) == 0)
strcat(missing, "-p ");
}
if (strlen(ss_opt.local_addr) == 0)
strcat(missing, "-u ");
if (strlen(ss_opt.local_port) == 0)
strcat(missing, "-b ");
if (strlen(ss_opt.password) == 0)
strcat(missing, "-k ");
if (strlen(ss_opt.method) == 0)
strcat(missing, "-m ");
if (strlen(missing) != 0) {
pr_err("Missing parameter(s): %s\n", missing);
usage(argv[0]);
exit(EXIT_FAILURE);
}
/* reopen log to user specified level */
closelog();
if (strcmp(type, "client") == 0)
openlog("sslocal", log_opt, LOG_DAEMON);
else if (strcmp(type, "server") == 0)
openlog("sserver", log_opt, LOG_DAEMON);
if (level == -1)
level = LOG_NOTICE;
setlogmask(LOG_UPTO(level));
}
void check_ss_option(int argc, char **argv, const char *type)
{
parse_cmdline(argc, argv, type);
if (daemonize) {
if (daemon(0, 0) == -1)
pr_exit("daemon failed: %s\n", strerror(errno));
}
pr_ss_option(type);
}
void pr_data(FILE *fp, const char *name, char *data, int len)
{
fprintf(fp, "%s:\n", name);
BIO_dump_fp(fp, (void *)data, len);
}
void _pr_link(int level, struct link *ln)
{
enum link_state state = ln->state;
char state_str[512] = {'\0'};
if (state & LOCAL && state & SERVER)
strcat(state_str, "linked");
else if (state & LOCAL)
strcat(state_str, "local");
else if (state & SERVER)
strcat(state_str, "server");
if (state & SS_UDP)
strcat(state_str, ", udp");
if (state & SS_IV_SENT && state & SS_IV_RECEIVED)
strcat(state_str, ", iv exchanged");
else if (state & SS_IV_SENT)
strcat(state_str, ", iv sent");
else if (state & SS_IV_RECEIVED)
strcat(state_str, ", iv received");
if (state & SS_TCP_HEADER_SENT)
strcat(state_str, ", ss tcp header sent");
else if (state & SS_TCP_HEADER_RECEIVED)
strcat(state_str, ", ss tcp header received");
else if (state & SOCKS5_CMD_REPLY_SENT)
strcat(state_str, ", socks5 cmd reply sent");
else if (state & SOCKS5_CMD_REQUEST_RECEIVED)
strcat(state_str, ", socks5 cmd request received");
else if (state & SOCKS5_AUTH_REPLY_SENT)
strcat(state_str, ", socks5 auth reply sent");
else if (state & SOCKS5_AUTH_REQUEST_RECEIVED)
strcat(state_str, ", socks5 auth request received");
if (state & LOCAL_SEND_PENDING)
strcat(state_str, ", local send pending");
if (state & LOCAL_READ_PENDING)
strcat(state_str, ", local read pending");
if (state & SERVER_READ_PENDING)
strcat(state_str, ", server read pending");
if (state & SERVER_SEND_PENDING)
strcat(state_str, ", server_send_pending");
syslog(level, "state: %s\n", state_str);
syslog(level, "local sockfd: %d; server sockfd: %d; "
"text len: %d; cipher len: %d;\n",
ln->local_sockfd, ln->server_sockfd,
ln->text_len, ln->cipher_len);
}
void pr_link_debug(struct link *ln)
{
_pr_link(LOG_DEBUG, ln);
}
void pr_link_info(struct link *ln)
{
_pr_link(LOG_INFO, ln);
}
void pr_link_notice(struct link *ln)
{
_pr_link(LOG_NOTICE, ln);
}
void pr_link_warn(struct link *ln)
{
_pr_link(LOG_WARNING, ln);
}
void ss_init(void)
{
int i, ret;
struct rlimit limit;
ret = getrlimit(RLIMIT_NOFILE, &limit);
if (ret == -1) {
pr_err("%s: %s\n", __func__, strerror(errno));
} else {
if (limit.rlim_cur < DEFAULT_MAX_CONNECTION)
nfds = limit.rlim_cur;
}
pr_info("%s: max connection: %d\n", __func__, nfds);
link_head = calloc(nfds, sizeof(void *));
if (link_head == NULL)
pr_exit("%s: calloc failed", __func__);
clients = calloc(nfds, sizeof(struct pollfd));
if (clients == NULL)
pr_exit("%s: calloc failed", __func__);
for (i = 0; i < nfds; i++)
clients[i].fd = -1;
}
void ss_exit(void)
{
if (link_head)
free(link_head);
if (clients)
free(clients);
}
void poll_events_string(short events, char *events_str)
{
if (events & POLLIN) {
if (strlen(events_str) == 0)
strcat(events_str, "POLLIN");
else
strcat(events_str, " POLLIN");
}
if (events & POLLOUT) {
if (strlen(events_str) == 0)
strcat(events_str, "POLLOUT");
else
strcat(events_str, " POLLOUT");
}
}
int poll_set(int sockfd, short events)
{
char events_str[42] = {'\0'};
if (sockfd < 0 || sockfd >= nfds) {
sock_err(sockfd, "%s: illegal sockfd(%d)", __func__, sockfd);
return -1;
}
clients[sockfd].fd = sockfd;
clients[sockfd].events = events;
poll_events_string(events, events_str);
sock_info(sockfd, "%s: %s", __func__, events_str);
return 0;
}
int poll_add(int sockfd, short events)
{
char events_str[42] = {'\0'};
if (sockfd < 0 || sockfd >= nfds) {
sock_err(sockfd, "%s: illegal sockfd(%d)", __func__, sockfd);
return -1;
}
if (clients[sockfd].fd != sockfd) {
sock_warn(sockfd, "%s: sockfd(%d) not in poll",
__func__, sockfd);
return -1;
}
clients[sockfd].events |= events;
poll_events_string(events, events_str);
sock_info(sockfd, "%s: %s", __func__, events_str);
return 0;
}
int poll_rm(int sockfd, short events)
{
char events_str[42] = {'\0'};
if (sockfd < 0 || sockfd >= nfds) {
sock_err(sockfd, "%s: illegal sockfd(%d)", __func__, sockfd);
return -1;
}
clients[sockfd].events &= ~events;
poll_events_string(events, events_str);
sock_info(sockfd, "%s: %s", __func__, events_str);
return 0;
}
int poll_del(int sockfd)
{
if (sockfd < 0 || sockfd >= nfds) {
sock_err(sockfd, "%s: illegal sockfd(%d)", __func__, sockfd);
return -1;
}
clients[sockfd].fd = -1;
sock_info(sockfd, "%s: deleted from poll", __func__);
return 0;
}
/**
* time_out - check if it's timed out
*
* @this: the time_t we want to compare(usually is NOW)
* @that: the time_t we want to check
* @value: how long we think it's a timeout
*
* Return: 0 means time out, -1 means not time out
*/
static int time_out(time_t this, time_t that, double value)
{
if (difftime(this, that) > value)
return 0;
else
return -1;
}
void reaper(void)
{
int sockfd;
double value;
struct link *ln;
time_t now = time(NULL);
static time_t checked = (time_t)-1;
if (checked == (time_t)-1) {
checked = now;
} else if (time_out(now, checked, TCP_INACTIVE_TIMEOUT) == -1) {
return;
} else {
checked = now;
}
for (sockfd = 0; sockfd < nfds; sockfd++) {
ln = link_head[sockfd];
if (ln == NULL)
continue;
if (ln->state & SERVER)
value = TCP_INACTIVE_TIMEOUT;
else
value = TCP_CONNECT_TIMEOUT;
if (time_out(now, ln->time, value) == 0) {
if (value == TCP_CONNECT_TIMEOUT)
pr_debug("%s: connect timeout, close\n",
__func__);
if (value == TCP_INACTIVE_TIMEOUT)
pr_debug("%s: inactive timeout, close\n",
__func__);
destroy_link(sockfd);
}
}
}
struct link *create_link(int sockfd, const char *type)
{
struct link *ln;
ln = calloc(1, sizeof(*ln));
if (ln == NULL)
goto err;
ln->text = malloc(TEXT_BUF_SIZE);
if (ln->text == NULL)
goto err;
ln->cipher = malloc(CIPHER_BUF_SIZE);
if (ln->cipher == NULL)
goto err;
/* cipher to encrypt local data */
ln->local_ctx = EVP_CIPHER_CTX_new();
if (ln->local_ctx == NULL)
goto err;
/* cipher to decrypt server data */
ln->server_ctx = EVP_CIPHER_CTX_new();
if (ln->server_ctx == NULL)
goto err;
ln->state |= LOCAL;
ln->local_sockfd = sockfd;
ln->server_sockfd = -1;
ln->time = time(NULL);
if (link_head[sockfd] != NULL) {
sock_warn(sockfd, "%s: link already exist for sockfd %d",
__func__, sockfd);
goto err;
}
link_head[sockfd] = ln;
return ln;
err:
if (ln->server_ctx)
EVP_CIPHER_CTX_free(ln->server_ctx);
if (ln->local_ctx)
EVP_CIPHER_CTX_free(ln->local_ctx);
if (ln->text)
free(ln->text);
if (ln->cipher)
free(ln->cipher);
if (ln)
free(ln);
sock_warn(sockfd, "%s: failed", __func__);
return NULL;
}
struct link *get_link(int sockfd)
{
if (sockfd < 0 || sockfd >= nfds) {
pr_warn("%s: invalid sockfd %d", __func__, sockfd);
return NULL;
}
if (link_head[sockfd] == NULL) {
sock_warn(sockfd, "%s: link doesn't exist", __func__);
return NULL;
}
return link_head[sockfd];
}
static void free_link(struct link *ln)
{
if (ln->text)
free(ln->text);
if (ln->cipher)
free(ln->cipher);
if (ln->local_ctx)
EVP_CIPHER_CTX_free(ln->local_ctx);
if (ln->server_ctx)
EVP_CIPHER_CTX_free(ln->server_ctx);
if (ln)
free(ln);
}
void destroy_link(int sockfd)
{
struct link *ln;
ln = get_link(sockfd);
if (ln == NULL)
return;
link_head[ln->local_sockfd] = NULL;
link_head[ln->server_sockfd] = NULL;
poll_del(ln->local_sockfd);
poll_del(ln->server_sockfd);
if (ln->local_sockfd >= 0)
close(ln->local_sockfd);
if (ln->server_sockfd >= 0)
close(ln->server_sockfd);
free_link(ln);
}
/* for udp, we just bind it, since udp can't listen */
int do_listen(struct addrinfo *info, const char *type_str)
{
int sockfd, type;
int opt = 1;
struct addrinfo *lp = info;
if (strcmp(type_str, "tcp") == 0)
type = SOCK_STREAM;
else if (strcmp(type_str, "udp") == 0)
type = SOCK_DGRAM;
else
pr_exit("%s: unknown socket type\n", __func__);
while (lp) {
if (lp->ai_socktype == type) {
type |= SOCK_NONBLOCK;
sockfd = socket(lp->ai_family, type, 0);
if (sockfd == -1)
goto err;
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) != 0)
goto err;
if (bind(sockfd, lp->ai_addr, lp->ai_addrlen) == -1)
goto err;
if (type & SOCK_STREAM)
if (listen(sockfd, SOMAXCONN) == -1)
goto err;
return sockfd;
}
lp = lp->ai_next;
}
err:
err_exit("do_listen");
}
int connect_server(int sockfd)
{
int new_sockfd, ret, type;
struct link *ln;
struct addrinfo *ai;
ln = get_link(sockfd);
if (ln == NULL)
return -1;
if (ln->server_sockfd != -1) {
pr_warn("%s is called twice on link, "
"return without doing anything\n",
__func__);
return 0;
}
if (ln->state & SS_UDP)
type = SOCK_DGRAM;
else
type = SOCK_STREAM;
ai = ln->server;
while (ai) {
if (ai->ai_socktype == type) {
type |= SOCK_NONBLOCK;
new_sockfd = socket(ai->ai_family, type, 0);
if (new_sockfd == -1)
goto err;
link_head[new_sockfd] = ln;
ln->server_sockfd = new_sockfd;
ln->time = time(NULL);
poll_set(new_sockfd, POLLIN);
ret = connect(new_sockfd, ai->ai_addr, ai->ai_addrlen);
if (ret == -1) {
/* it's ok to return inprogress, will
* handle it later */
if (errno == EINPROGRESS) {
poll_add(new_sockfd, POLLOUT);
return 0;
} else {
goto err;
}
}
/* sucessfully connected */
ln->state |= SERVER;
sock_info(new_sockfd, "%s: connected", __func__);
return 0;
}
ai = ai->ai_next;
}
err:
perror("connect_server");
return -1;
}
int add_data(int sockfd, struct link *ln,
const char *type, char *data, int size)
{
char *buf;
int len;
if (strcmp(type, "text") == 0) {
buf = ln->text;
len = ln->text_len;
if (len + size > TEXT_BUF_SIZE) {
sock_warn(sockfd, "%s: data exceed max length(%d/%d)",
__func__, len + size, TEXT_BUF_SIZE);
return -1;
}
ln->text_len += size;
} else if (strcmp(type, "cipher") == 0) {
buf = ln->cipher;
len = ln->cipher_len;
if (len + size > CIPHER_BUF_SIZE) {
sock_warn(sockfd, "%s: data exceed max length(%d/%d)",
__func__, len + size, CIPHER_BUF_SIZE);
return -1;
}
ln->cipher_len += size;
} else {
sock_warn(sockfd, "%s: unknown type", __func__);
return -1;
}
/* if len == 0, no data need to be moved */
if (len > 0)
memmove(buf + size, buf, len);
memcpy(buf, data, size);
return 0;
}
int rm_data(int sockfd, struct link *ln, const char *type, int size)
{
char *buf;
int len;
if (strcmp(type, "text") == 0) {
buf = ln->text;
if (ln->text_len < size) {
sock_warn(sockfd, "%s: size is too big(%d/%d)",
__func__, size, ln->text_len);
return -1;
}
ln->text_len -= size;
len = ln->text_len;
} else if (strcmp(type, "cipher") == 0) {
buf = ln->cipher;
if (ln->cipher_len < size) {
sock_warn(sockfd, "%s: size is too big(%d/%d)",
__func__, size, ln->cipher_len);
return -1;
}
ln->cipher_len -= size;
len = ln->cipher_len;
} else {
sock_warn(sockfd, "%s: unknown type", __func__);
return -1;
}
memmove(buf, buf + size, len);
return 0;
}
int check_ss_header(int sockfd, struct link *ln)
{
int ret;
char atyp;
char addr[256];
unsigned short port;
char port_str[6];
short addr_len;
struct ss_header *req;
struct addrinfo hint;
struct addrinfo *res;
memset(&hint, 0, sizeof(hint));
hint.ai_socktype = SOCK_STREAM;
req = (void *)ln->text;
if (ln->state & SS_UDP) {
hint.ai_socktype = SOCK_DGRAM;
} else {
hint.ai_socktype = SOCK_STREAM;
}
atyp = req->atyp;
if (atyp == SOCKS5_ADDR_IPV4) {
addr_len = 4;
/* atyp(1) + ipv4_addrlen(4) + port(2) */
if (ln->text_len < 7) {
goto too_short;
}
hint.ai_family = AF_INET;
if (inet_ntop(AF_INET, req->dst, addr, sizeof(addr)) == NULL) {
sock_warn(sockfd, "%s: inet_ntop() %s",
__func__, strerror(errno));
return -1;
}
port = ntohs(*(unsigned short *)(req->dst + addr_len));
} else if (atyp == SOCKS5_ADDR_DOMAIN) {
addr_len = req->dst[0];
/* atyp(1) + addr_size(1) + domain_len(addr_len) + port(2) */
if (ln->text_len < 1 + 1 + addr_len + 2)
goto too_short;
hint.ai_family = AF_UNSPEC;
strncpy(addr, req->dst + 1, addr_len);
addr[addr_len] = '\0';
port = ntohs(*(unsigned short *)(req->dst + addr_len + 1));
/* to compute the right data length(except header) */
addr_len += 1;
} else if (atyp == SOCKS5_ADDR_IPV6) {
hint.ai_family = AF_INET6;
addr_len = 16;
if (inet_ntop(AF_INET6, req->dst, addr, sizeof(addr)) == NULL) {
sock_warn(sockfd, "%s: inet_ntop() %s",
__func__, strerror(errno));
return -1;
}
port = ntohs(*(unsigned short *)(req->dst + addr_len));
} else {
sock_warn(sockfd, "%s: ATYP(%d) isn't legal");
return -1;
}
sock_info(sockfd, "%s: remote address: %s; port: %d",
__func__, addr, port);
sprintf(port_str, "%d", port);
ret = getaddrinfo(addr, port_str, &hint, &res);
if (ret != 0) {
sock_warn(sockfd, "getaddrinfo error: %s", gai_strerror(ret));
return -1;
}
if (ln->state & SS_UDP) {
ln->ss_header_len = ln->text_len;
} else {
ln->ss_header_len = 1 + addr_len + 2;
if (rm_data(sockfd, ln, "text", ln->ss_header_len) == -1)
return -1;
}
ln->server = res;
if (connect_server(sockfd) == -1)
return -1;
return 0;
too_short:
sock_warn(sockfd, "%s: text is too short",
__func__);
return -1;
}
int check_socks5_auth_header(int sockfd, struct link *ln)
{
unsigned short i;
struct socks5_auth_request *req;
if (ln->text_len < 3) {
sock_warn(sockfd, "%s: text len is smaller than auth request",
__func__);
return -1;
}
req = (void *)ln->text;
if (req->ver != 0x05) {
sock_warn(sockfd, "%s: VER(%d) is not 5",
__func__, req->ver);
return -1;
}
i = req->nmethods;
if ((i + 2) != ln->text_len) {
sock_warn(sockfd, "%s: NMETHODS(%d) isn't correct",
__func__, i);
return -1;
}
while (i-- > 0)
if (req->methods[i] == 0x00)
return 0;
sock_warn(sockfd, "%s: only support NO AUTHENTICATION");
return -1;
}
int check_socks5_cmd_header(int sockfd, struct link *ln)
{
char cmd, atyp;
int ss_header_len;
struct socks5_cmd_request *req;
req = (void *)ln->text;
if (req->ver != 0x05) {
sock_warn(sockfd, "%s: VER(%d) is not 5",
__func__, req->ver);
return -1;
}