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ProxyRequest.c
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#include "ProxyRequest.h"
#include "ProxyLists.h"
#include "Global.h"
#include "Base64.h"
#include "Logger.h"
#include "Config.h"
#include "ProxyRemove.h"
#include "DNS.h"
#include <event2/bufferevent.h>
#include <event2/event.h>
#include <event2/buffer.h>
#include <event2/util.h>
#include <event2/bufferevent_ssl.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#ifdef __linux__
#include <arpa/inet.h>
#include <unistd.h>
#endif
#include <time.h>
#include <limits.h>
#include <assert.h>
static void RequestFree(evutil_socket_t fd, short what, UNCHECKED_PROXY *UProxy)
{
//Log(LOG_LEVEL_DEBUG, "RequestFree BuffEvent free %p", UProxy->assocBufferEvent);
bufferevent_free(UProxy->assocBufferEvent);
if (UProxy->timeout != NULL) {
event_del(UProxy->timeout);
event_free(UProxy->timeout);
UProxy->timeout = NULL;
} else {
Log(LOG_LEVEL_ERROR, "Timeout-less proxy");
Log(LOG_LEVEL_ERROR, "Please report this bug");
assert(false);
}
if (UProxy->udpRead != NULL) {
event_del(UProxy->udpRead);
event_free(UProxy->udpRead);
UProxy->udpRead = NULL;
}
//char *ip = IPv6MapToString(UProxy->ip); {
//Log(LOG_LEVEL_DEBUG, "RequestFree -> %s", ip);
//} free(ip);
InterlockedDecrement(&CurrentlyChecking);
pthread_mutex_lock(&LockUncheckedProxies); {
} pthread_mutex_unlock(&LockUncheckedProxies);
pthread_mutex_lock(&(UProxy->processing));
if (UProxy->associatedProxy == NULL) {
if (!UProxy->checkSuccess)
UProxy->retries++;
if (UProxy->retries >= AcceptableSequentialFails || UProxy->checkSuccess) {
char *ip = IPv6MapToString(UProxy->ip); {
Log(LOG_LEVEL_DEBUG, "RequestFree: Removing proxy %s...", ip);
} free(ip);
UProxyRemove(UProxy);
} else {
pthread_mutex_unlock(&(UProxy->processing));
UProxy->checking = false;
}
} else {
if (UProxy->pageTarget == NULL) {
char *ip = IPv6MapToString(UProxy->ip); {
Log(LOG_LEVEL_DEBUG, "RequestFree: Removing proxy %s and updating parent...", ip);
} free(ip);
if (!UProxy->checkSuccess)
UProxyFailUpdateParentInfo(UProxy);
else
UProxySuccessUpdateParentInfo(UProxy);
if (UProxy->singleCheckCallback != NULL)
UProxy->singleCheckCallback(UProxy);
} else if (UProxy->getResponse)
((SingleCheckCallbackCPage)(UProxy->singleCheckCallback))(UProxy, UPROXY_CUSTOM_PAGE_STAGE_END);
UProxyRemove(UProxy);
}
}
typedef enum _SOCKS_TYPE {
SOCKS_TYPE_CONNECT = 0x01,
SOCKS_TYPE_BIND = 0x02,
SOCKS_TYPE_UDP_ASSOCIATE = 0x03
} SOCKS_TYPE;
static bool SOCKS4(SOCKS_TYPE Type, UNCHECKED_PROXY *UProxy)
{
if (Type == SOCKS_TYPE_UDP_ASSOCIATE)
return false;
if (UProxy->stage == UPROXY_STAGE_INITIAL_PACKET) {
/*
field 1: SOCKS version number, 1 byte, must be 0x04 for this version
field 2: command code, 1 byte:
0x01 = establish a TCP/IP stream connection
0x02 = establish a TCP/IP port binding
field 3: network byte order port number, 2 bytes
field 4: network byte order IP address, 4 bytes
field 5: the user ID string, variable length, terminated with a null (0x00)
*/
struct {
uint8_t ver;
uint8_t cmd;
uint16_t port;
uint32_t IPv4;
uint8_t userId;
} __attribute__((packed)) buffer;
buffer.ver = 0x04;
buffer.cmd = 0x01; // CONNECT
buffer.port = htons(UProxy->targetPort);
buffer.IPv4 = htonl(UProxy->targetIPv4->Data[3]);
buffer.userId = 0x00;
bufferevent_write(UProxy->assocBufferEvent, &buffer, 9);
bufferevent_setwatermark(UProxy->assocBufferEvent, EV_READ, 8, 0);
return true;
} else if (UProxy->stage == UPROXY_STAGE_INITIAL_RESPONSE) {
size_t len = evbuffer_get_length(bufferevent_get_input(UProxy->assocBufferEvent));
uint8_t data[2];
if (len != 8)
return false;
evbuffer_remove(bufferevent_get_input(UProxy->assocBufferEvent), data, 2);
Log(LOG_LEVEL_DEBUG, "SOCKS4: Stage 2 data[1]: %d", data[1]);
return data[1] == 0x5A;
} else {
assert(false);
return false;
}
}
typedef enum _SOCKS5_RET_STATUS {
SOCKS5_RET_STATUS_FAILURE = 0,
SOCKS5_RET_STATUS_SUCCESS = 1,
SOCKS5_RET_STATUS_IPV4_FAILED = 2,
SOCKS5_RET_STATUS_IPV6_FAILED = 3
} SOCKS5_RET_STATUS;
static SOCKS5_RET_STATUS SOCKS5(SOCKS_TYPE Type, uint16_t *Port, UNCHECKED_PROXY *UProxy, char *Domain)
{
/*
field 1: SOCKS version number (must be 0x05 for this version)
field 2: number of authentication methods supported, 1 byte
field 3: authentication methods, variable length, 1 byte per method supported
0x00: No authentication
0x01: GSSAPI
0x02: Username/Password
0x03–0x7F: methods assigned by IANA
0x80–0xFE: methods reserved for private use
+----+-----+-------+------+----------+----------+
|VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
+----+-----+-------+------+----------+----------+
| 1 | 1 | X'00' | 1 | Variable | 2 |
+----+-----+-------+------+----------+----------+
o VER protocol version: X'05'
o CMD
o CONNECT X'01'
o BIND X'02'
o UDP ASSOCIATE X'03'
o RSV RESERVED
o ATYP address type of following address
o IP V4 address: X'01'
o DOMAINNAME: X'03'
o IP V6 address: X'04'
o DST.ADDR desired destination address // network octet order? nope
o DST.PORT desired destination port in network octet order
*/
switch (UProxy->stage) {
case UPROXY_STAGE_INITIAL_PACKET:
{
uint8_t buff[3];
buff[0] = 0x05;
buff[1] = 1; // 1 auth
buff[2] = 0x00; // no auth
bufferevent_write(UProxy->assocBufferEvent, buff, 3);
bufferevent_setwatermark(UProxy->assocBufferEvent, EV_READ, 2, 0);
break;
}
case UPROXY_STAGE_INITIAL_RESPONSE:
{
size_t len = evbuffer_get_length(bufferevent_get_input(UProxy->assocBufferEvent));
uint8_t data[2];
Log(LOG_LEVEL_DEBUG, "SOCKS5: Stage 1 data len: %d", len);
if (len != 2)
return false;
evbuffer_remove(bufferevent_get_input(UProxy->assocBufferEvent), data, 2);
Log(LOG_LEVEL_DEBUG, "SOCKS5: Stage 1 data[1]: %d", data[1]);
return data[1] == 0x00;
}
case UPROXY_STAGE_SOCKS5_MAIN_PACKET:
{
IP_TYPE ipType = GetIPType(UProxy->ip); // Prefered
if (ipType == IPV4 && UProxy->targetIPv4 == NULL)
ipType = IPV6;
if (ipType == IPV6 && UProxy->targetIPv6 == NULL)
ipType = IPV4;
// -> Real
size_t domainLen = Domain != NULL ? strlen(Domain) : 0;
uint8_t *buff;
if (UProxy->pageTarget != NULL && SOCKS5ResolveDomainsRemotely) {
Log(LOG_LEVEL_DEBUG, "SOCKS5: Stage 2 Domain");
buff = alloca(5 + domainLen + sizeof(uint16_t));
} else {
if (ipType == IPV4) {
Log(LOG_LEVEL_DEBUG, "SOCKS5: Stage 2 IPV4");
buff = alloca(4 + IPV4_SIZE + sizeof(uint16_t));
} else {
Log(LOG_LEVEL_DEBUG, "SOCKS5: Stage 2 IPV6");
buff = alloca(4 + IPV6_SIZE + sizeof(uint16_t));
}
}
size_t portOffset;
buff[0] = 0x05; // again?
buff[1] = Type;
buff[2] = 0x00; // RESERVED
if (UProxy->pageTarget != NULL && SOCKS5ResolveDomainsRemotely && Domain != NULL) {
buff[3] = 0x03;
buff[4] = (uint8_t)domainLen;
memcpy(&(buff[5]), Domain, domainLen);
portOffset = 1 + domainLen;
} else {
buff[3] = ipType == IPV4 ? 0x01 : 0x04; // who was 0x02?
if (ipType == IPV4) {
(*(uint32_t*)(&(buff[4]))) = UProxy->targetIPv4->Data[3];
portOffset = IPV4_SIZE;
} else {
memcpy(&(buff[4]), UProxy->targetIPv6->Data, IPV6_SIZE);
portOffset = IPV6_SIZE;
}
*((uint16_t*)&(buff[4 + portOffset])) = Type != SOCKS_TYPE_UDP_ASSOCIATE ? htons(*Port) : 0;
}
Log(LOG_LEVEL_DEBUG, "portOffset %d", portOffset);
bufferevent_write(UProxy->assocBufferEvent, buff, 4 + portOffset + sizeof(uint16_t));
bufferevent_setwatermark(UProxy->assocBufferEvent, EV_READ, 10, 0);
break;
}
case UPROXY_STAGE_SOCKS5_RESPONSE:
{
bufferevent_setwatermark(UProxy->assocBufferEvent, EV_READ, 1, 0);
size_t len = evbuffer_get_length(bufferevent_get_input(UProxy->assocBufferEvent));
if (len < 4) {
Log(LOG_LEVEL_DEBUG, "SOCKS5: Stage 3 data len failure 1");
return false;
}
uint8_t header[4];
evbuffer_remove(bufferevent_get_input(UProxy->assocBufferEvent), header, 4);
size_t addressType = header[3];
Log(LOG_LEVEL_DEBUG, "data[1] %x", header[1]);
if (header[1] == 0x08 || header[1] == 0x02) {
Log(LOG_LEVEL_DEBUG, "ipType %s", addressType == 0x01 ? "SOCKS5_RET_STATUS_IPV4_FAILED" : "SOCKS5_RET_STATUS_IPV6_FAILED");
return addressType == 0x01 ? SOCKS5_RET_STATUS_IPV4_FAILED : SOCKS5_RET_STATUS_IPV6_FAILED; // Recoverable failure, tries to connect with different address type.
}
size_t domainLen, dataLen;
if (addressType == 0x03) {
evbuffer_remove(bufferevent_get_input(UProxy->assocBufferEvent), header, 1);
domainLen = header[0];
dataLen = domainLen + sizeof(uint16_t);
} else if (addressType == 0x01) {
dataLen = IPV4_SIZE + sizeof(uint16_t);
} else if (addressType == 0x04) {
dataLen = IPV6_SIZE + sizeof(uint16_t);
} else {
Log(LOG_LEVEL_DEBUG, "SOCKS5: Stage 3 malformed packet");
return false;
}
uint8_t data[dataLen];
len = evbuffer_get_length(bufferevent_get_input(UProxy->assocBufferEvent));
Log(LOG_LEVEL_DEBUG, "SOCKS5: Stage 3 data len: %d", len);
if (len != dataLen) {
Log(LOG_LEVEL_DEBUG, "SOCKS5: Stage 3 data len failure 2");
return false;
}
evbuffer_remove(bufferevent_get_input(UProxy->assocBufferEvent), data, dataLen);
memcpy(Port, &(data[dataLen - 2]), 2);
*Port = ntohs(*Port);
Log(LOG_LEVEL_DEBUG, "SOCKS5: Stage 3 port: %d", *Port);
return true;
}
default: {
assert(false);
break;
}
}
return true;
}
void ProxyDNSReResolved(struct dns_cb_data *data)
{
DNS_LOOKUP_ASYNC_EX *ex = data->context;
UNCHECKED_PROXY *newProxy = ex->object;
Log(LOG_LEVEL_DEBUG, "ProxyDNSReResolved");
pthread_mutex_lock(&(newProxy->processing));
if (data->addr_len <= 0) {
// Secondary address type failed, delete proxy
UProxyFree(newProxy);
return;
}
if (!ex->ipv6) {
newProxy->targetIPv4 = zalloc(sizeof(IPv6Map));
memcpy(&(newProxy->targetIPv4->Data[3]), data->addr, IPV4_SIZE);
newProxy->targetIPv4->Data[2] = 0xFFFF0000;
#if DEBUG
char *ip = IPv6MapToString2(newProxy->targetIPv4); {
Log(LOG_LEVEL_DEBUG, "ProxyDNSReResolved IPv4 %s", ip);
} free(ip);
#endif
} else if (ex->ipv6) {
newProxy->targetIPv6 = malloc(sizeof(IPv6Map));
memcpy(newProxy->targetIPv6->Data, data->addr, IPV6_SIZE);
#if DEBUG
char *ip = IPv6MapToString2(newProxy->targetIPv6); {
Log(LOG_LEVEL_DEBUG, "ProxyDNSReResolved IPv6 %s", ip);
} free(ip);
#endif
} else {
assert(false);
return;
}
UProxyAdd(newProxy);
RequestAsync(newProxy);
pthread_mutex_unlock(&(newProxy->processing));
}
void ProxyDNSResolved(struct dns_cb_data *data)
{
DNS_LOOKUP_ASYNC_EX *ex = (DNS_LOOKUP_ASYNC_EX*)data->context;
UNCHECKED_PROXY *UProxy = (UNCHECKED_PROXY*)ex->object;
pthread_mutex_lock(&(UProxy->processing));
if (!ex->ipv6)
UProxy->dnsResolveInProgress &= ~IPV4;
if (ex->ipv6)
UProxy->dnsResolveInProgress &= ~IPV6;
if (data->addr_len > 0) {
bool firstResolve = UProxy->targetIPv4 == NULL && UProxy->targetIPv6 == NULL;
if (!ex->ipv6 && UProxy->targetIPv4 == NULL) {
UProxy->targetIPv4 = zalloc(sizeof(IPv6Map));
memcpy(&(UProxy->targetIPv4->Data[3]), data->addr, IPV4_SIZE);
UProxy->targetIPv4->Data[2] = 0xFFFF0000;
#if DEBUG
char *ip = IPv6MapToString2(UProxy->targetIPv4); {
Log(LOG_LEVEL_DEBUG, "ProxyDNSResolved IPv4 %s", ip);
} free(ip);
#endif
}
else if (ex->ipv6 && UProxy->targetIPv6 == NULL) {
UProxy->targetIPv6 = malloc(sizeof(IPv6Map));
memcpy(UProxy->targetIPv6->Data, data->addr, IPV6_SIZE);
#if DEBUG
char *ip = IPv6MapToString2(UProxy->targetIPv6); {
Log(LOG_LEVEL_DEBUG, "ProxyDNSResolved IPv6 %s", ip);
} free(ip);
#endif
}
if (firstResolve) {
Log(LOG_LEVEL_DEBUG, "ProxyDNSResolved -> ProxyHandleData CONNECT");
pthread_mutex_unlock(&(UProxy->processing));
ProxyHandleData(UProxy, EV_TYPE_CONNECT);
} else
pthread_mutex_unlock(&(UProxy->processing));
} else if (UProxy->targetIPv4 == NULL && UProxy->targetIPv6 == NULL && UProxy->dnsResolveInProgress == 0) {
bufferevent_setcb(UProxy->assocBufferEvent, NULL, NULL, NULL, NULL);
if (UProxy->timeout != NULL)
event_active(UProxy->timeout, EV_TIMEOUT, 0);
else {
Log(LOG_LEVEL_ERROR, "Timeout-less proxy 2");
Log(LOG_LEVEL_ERROR, "Please report this bug");
assert(false);
}
if (data->error != DNS_DOES_NOT_EXIST)
Log(LOG_LEVEL_WARNING, "Failed to lookup CPage DNS");
pthread_mutex_unlock(&(UProxy->processing));
} else
pthread_mutex_unlock(&(UProxy->processing));
ex->resolveDone = true;
}
static void ProxyDNSFreed(DNS_LOOKUP_ASYNC_EX *Ex)
{
UNCHECKED_PROXY *UProxy = Ex->object;
Log(LOG_LEVEL_DEBUG, "DNS FREEEEEEEEEEEEEEEEEEEEEEED! IPv6? %s", Ex->ipv6 ? "ye" : "nah");
pthread_mutex_lock(&(UProxy->processing));
for (size_t x = 0; x < UProxy->dnsLookupsCount; x++) {
if (UProxy->dnsLookups[x] == Ex) {
UProxy->dnsLookupsCount--;
if (UProxy->dnsLookupsCount > 0) {
UProxy->dnsLookups[x] = UProxy->dnsLookups[UProxy->dnsLookupsCount];
} else {
free(UProxy->dnsLookups);
UProxy->dnsLookups = NULL;
}
pthread_mutex_unlock(&(UProxy->processing));
return;
}
}
}
static void ProxyDNSResolve(UNCHECKED_PROXY *UProxy, char *Domain)
{
if (UProxy->pageTarget == NULL)
return;
UProxy->dnsResolveInProgress = IPV4 | IPV6;
UProxy->dnsLookups = malloc(sizeof(DNS_LOOKUP_ASYNC_EX*) * 2);
UProxy->dnsLookups[0] = DNSResolveAsync(UProxy, Domain, true, ProxyDNSResolved, ProxyDNSFreed);
if (UProxy->dnsLookups[0] != NULL)
UProxy->dnsLookupsCount++;
UProxy->dnsLookups[UProxy->dnsLookupsCount] = DNSResolveAsync(UProxy, Domain, false, ProxyDNSResolved, ProxyDNSFreed);
if (UProxy->dnsLookups[UProxy->dnsLookupsCount] != NULL)
UProxy->dnsLookupsCount++;
}
static MEM_OUT char *ProxyParseUrl(UNCHECKED_PROXY *UProxy, bool OnlyDomain, bool IncludePort, OUT char **Path)
{
char *domain;
if (strstr(UProxy->pageTarget, "https://") == NULL && strstr(UProxy->pageTarget, "http://") == NULL && strstr(UProxy->pageTarget, "udp://") == NULL)
return NULL;
if (strncmp(UProxy->pageTarget, "https", 5) == 0) {
domain = strdup(UProxy->pageTarget + 8);
} else if (strncmp(UProxy->pageTarget, "http", 4) == 0)
domain = strdup(UProxy->pageTarget + 7);
else
domain = strdup(UProxy->pageTarget + 6);
char *pathStart = strstr(domain, "/");
if (pathStart != NULL) {
if (Path != NULL)
*Path = strdup(pathStart);
*pathStart = 0x00;
} else {
if (Path != NULL)
*Path = NULL;
}
char *portStart = strchr(domain, ':');
if (portStart == NULL) {
if (!OnlyDomain)
UProxy->targetPort = strstr(UProxy->pageTarget, "https://") != NULL ? HTTPS_DEFAULT_PORT : HTTP_DEFAULT_PORT;
} else {
*portStart = 0x00;
if (IncludePort) {
UProxy->targetPort = atoi(portStart + sizeof(char));
if (UProxy->targetPort == 80 || UProxy->targetPort == 443)
*portStart = ':';
}
}
if (OnlyDomain)
return domain;
IPv6Map *ip = StringToIPv6Map(domain);
if (ip != NULL) {
if (GetIPType(ip) == IPV6)
UProxy->targetIPv6 = ip;
else
UProxy->targetIPv4 = ip;
}
return domain;
}
void ProxyHandleData(UNCHECKED_PROXY *UProxy, PROXY_HANDLE_DATA_EV_TYPE EVType)
{
Log(LOG_LEVEL_DEBUG, "ProxyHandleData: Proxy %s (%d), stage %d EVType %s", ProxyGetTypeString(UProxy->type), UProxy->type, UProxy->stage, EVType == EV_TYPE_READ ? "EV_TYPE_READ" : (EVType == EV_TYPE_WRITE ? "EV_TYPE_WRITE" : "EV_TYPE_CONNECT"));
char *reqString;
#define EVTYPE_CASE(x) if (EVType != x) { pthread_mutex_unlock(&(UProxy->processing)); Log(LOG_LEVEL_DEBUG, "PROCESSING UNLOCK!CASE"); return; }
#define EVTYPE_CASE_NOT(x) if (EVType == x) { pthread_mutex_unlock(&(UProxy->processing)); Log(LOG_LEVEL_DEBUG, "PROCESSING UNLOCK!CASE NOT"); return; }
Log(LOG_LEVEL_DEBUG, "PROCESSING LOCK!");
pthread_mutex_lock(&(UProxy->processing));
switch (UProxy->type) {
case PROXY_TYPE_HTTP: {
// Initial plain HTTP stage, go straight to sending HTTP request
if (UProxy->stage != UPROXY_STAGE_HTTP_RESPONSE && UProxy->stage != UPROXY_STAGE_HTTP_DDL_PAGE) {
EVTYPE_CASE(EV_TYPE_CONNECT);
UProxy->stage = UPROXY_STAGE_HTTP_REQUEST;
}
break;
}
case PROXY_TYPE_HTTPS: {
switch (UProxy->stage) {
case UPROXY_STAGE_INITIAL_PACKET: {
// Initial HTTPS stage, format CONNECT request and send it, proceed to stage 1
EVTYPE_CASE(EV_TYPE_CONNECT);
if (UProxy->pageTarget == NULL) {
Log(LOG_LEVEL_DEBUG, "Proxy type HTTPS target const");
char *host = HostHostnameSSL != NULL ? HostHostnameSSL : GetHost(GetIPType(UProxy->ip), ProxyIsSSL(UProxy->type));
Log(LOG_LEVEL_DEBUG, "Proxy type HTTPS target const host %s", host);
reqString = StrReplaceToNew(RequestStringSSL, "{HOST}", host); {
if (strstr(reqString, "{KEY_VAL}") != NULL) {
char *key;
Base64Encode(UProxy->identifier, PROXY_IDENTIFIER_LEN, &key); {
StrReplaceOrig(&reqString, "{KEY_VAL}", key);
} free(key);
}
Log(LOG_LEVEL_DEBUG, "HTTPS ReqString:");
Log(LOG_LEVEL_DEBUG, reqString);
bufferevent_write(UProxy->assocBufferEvent, (void*)reqString, strlen(reqString));
} free(reqString);
} else {
Log(LOG_LEVEL_DEBUG, "Proxy type HTTPS target page");
char *domain = ProxyParseUrl(UProxy, true, true, NULL); {
if (domain == NULL)
goto fail;
reqString = StrReplaceToNew(RequestStringSSL, "{HOST}", domain);
if (strstr(reqString, "{KEY_VAL}") != NULL) {
char *key;
Base64Encode(UProxy->identifier, PROXY_IDENTIFIER_LEN, &key); {
StrReplaceOrig(&reqString, "{KEY_VAL}", key);
} free(key);
}
Log(LOG_LEVEL_DEBUG, "Proxy type HTTPS target page domain", domain);
} free(domain);
Log(LOG_LEVEL_DEBUG, "HTTPS ReqString:");
Log(LOG_LEVEL_DEBUG, reqString);
bufferevent_write(UProxy->assocBufferEvent, (void*)reqString, strlen(reqString));
free(reqString);
}
UProxy->stage = UPROXY_STAGE_INITIAL_RESPONSE;
break;
}
case UPROXY_STAGE_INITIAL_RESPONSE: {
// HTTPS stage 1, check if CONNECT request response is 200
EVTYPE_CASE(EV_TYPE_READ);
// HTTP/1.1 200
size_t len = evbuffer_get_length(bufferevent_get_input(UProxy->assocBufferEvent));
char data[12];
if (len < 12)
goto fail;
evbuffer_remove(bufferevent_get_input(UProxy->assocBufferEvent), data, 12);
if (strncmp(data + 9, "200", 3) != 0)
goto fail;
Log(LOG_LEVEL_DEBUG, "Proxy type HTTPS CONNECT read OK");
UProxy->stage = UPROXY_STAGE_SSL_HANDSHAKE;
break;
}
default: {
assert(false);
break;
}
}
break;
}
case PROXY_TYPE_SOCKS4:
case PROXY_TYPE_SOCKS4A:
case PROXY_TYPE_SOCKS4_TO_SSL:
case PROXY_TYPE_SOCKS4A_TO_SSL: {
if (GetIPType(UProxy->ip) == IPV4) // ???
goto fail;
switch (UProxy->stage) {
case UPROXY_STAGE_INITIAL_PACKET: {
EVTYPE_CASE(EV_TYPE_CONNECT);
if (UProxy->pageTarget == NULL) {
SOCKS4(SOCKS_TYPE_CONNECT, UProxy);
UProxy->stage = UPROXY_STAGE_INITIAL_RESPONSE;
} else {
char *domain = ProxyParseUrl(UProxy, false, false, NULL); {
if (domain == NULL)
goto fail;
if (UProxy->targetIPv4 == NULL && UProxy->targetIPv6 == NULL) {
ProxyDNSResolve(UProxy, domain);
free(domain);
Log(LOG_LEVEL_DEBUG, "PROCESSING UNLOCK!1");
pthread_mutex_unlock(&(UProxy->processing));
return;
} else {
SOCKS4(SOCKS_TYPE_CONNECT, UProxy);
UProxy->stage = UPROXY_STAGE_INITIAL_RESPONSE;
}
} free(domain);
}
break;
}
case UPROXY_STAGE_INITIAL_RESPONSE: {
EVTYPE_CASE(EV_TYPE_READ);
if (!SOCKS4(SOCKS_TYPE_CONNECT, UProxy))
goto fail;
UProxy->stage = ProxyIsSSL(UProxy->type) ? UPROXY_STAGE_SSL_HANDSHAKE : UPROXY_STAGE_HTTP_REQUEST;
}
default: {
assert(false);
break;
}
}
break;
}
case PROXY_TYPE_SOCKS5:
case PROXY_TYPE_SOCKS5_TO_SSL:
case PROXY_TYPE_SOCKS5_WITH_UDP: {
uint16_t port = UProxy->targetPort;
SOCKS_TYPE socksType = UProxy->type == PROXY_TYPE_SOCKS5_WITH_UDP ? SOCKS_TYPE_UDP_ASSOCIATE : SOCKS_TYPE_CONNECT;
switch (UProxy->stage) {
case UPROXY_STAGE_INITIAL_PACKET: {
EVTYPE_CASE(EV_TYPE_CONNECT);
SOCKS5(0, NULL, UProxy, NULL);
Log(LOG_LEVEL_DEBUG, "SOCKS5 advance to stage 1");
UProxy->stage = UPROXY_STAGE_INITIAL_RESPONSE;
break;
}
case UPROXY_STAGE_INITIAL_RESPONSE: {
EVTYPE_CASE(EV_TYPE_READ);
if (SOCKS5(0, NULL, UProxy, NULL)) {
Log(LOG_LEVEL_DEBUG, "SOCKS5 advance to stage 2");
Log(LOG_LEVEL_DEBUG, "UPROXY_STAGE_INITIAL_RESPONSE: UProxy->pageTarget != NULL: %s", UProxy->pageTarget != NULL ? "true" : "false");
Log(LOG_LEVEL_DEBUG, "!SOCKS5ResolveDomainsRemotely: %s", !SOCKS5ResolveDomainsRemotely ? "true" : "false");
Log(LOG_LEVEL_DEBUG, "UProxy->targetIPv4 == NULL: %s", UProxy->targetIPv4 == NULL ? "true" : "false");
Log(LOG_LEVEL_DEBUG, "UProxy->targetIPv6 == NULL: %s", UProxy->targetIPv6 == NULL ? "true" : "false");
/*
* IPv4 and IPv6 null check for if when contacted SOCKS5 proxy rejected first IP type and system re-requests with other one.
* In this case targetIPv4 or targetIPv6 will be already filled in.
*/
if (UProxy->pageTarget != NULL && !SOCKS5ResolveDomainsRemotely && UProxy->targetIPv4 == NULL && UProxy->targetIPv6 == NULL) {
char *domain = ProxyParseUrl(UProxy, false, false, NULL); {
if (domain == NULL) {
Log(LOG_LEVEL_DEBUG, "SOCKS5 stage 2 domain NULL");
goto fail;
}
UProxy->stage = UPROXY_STAGE_SOCKS5_DNS_RESOLVE;
ProxyDNSResolve(UProxy, domain);
Log(LOG_LEVEL_DEBUG, "SOCKS5 stage 2 pending resolve");
} free(domain);
Log(LOG_LEVEL_DEBUG, "PROCESSING UNLOCK!2");
pthread_mutex_unlock(&(UProxy->processing));
return;
} else
UProxy->stage = UPROXY_STAGE_SOCKS5_MAIN_PACKET;
Log(LOG_LEVEL_DEBUG, "UPROXY_STAGE_SOCKS5_MAIN_PACKET: UProxy->pageTarget != NULL: %s", UProxy->pageTarget != NULL ? "true" : "false");
Log(LOG_LEVEL_DEBUG, "SOCKS5ResolveDomainsRemotely: %s", SOCKS5ResolveDomainsRemotely ? "true" : "false");
// Case described above in comments doesn't happen if domains are resolved remotely
if (UProxy->pageTarget != NULL && SOCKS5ResolveDomainsRemotely) {
char *domain = ProxyParseUrl(UProxy, false, false, NULL); {
if (domain == NULL) {
Log(LOG_LEVEL_DEBUG, "SOCKS5 stage 2 domain 2 NULL");
goto fail;
}
SOCKS5(socksType, &port, UProxy, domain);
} free(domain);
} else
SOCKS5(socksType, &port, UProxy, NULL);
UProxy->stage = UPROXY_STAGE_SOCKS5_RESPONSE;
Log(LOG_LEVEL_DEBUG, "SOCKS5 advance to stage 3");
// This handles two stages because after first stage, there's no one to send packet after receiving response
} else
goto fail;
break;
}
case UPROXY_STAGE_SOCKS5_DNS_RESOLVE: {
EVTYPE_CASE(EV_TYPE_CONNECT);
Log(LOG_LEVEL_DEBUG, "SOCKS5 DNS stage");
if (UProxy->pageTarget == NULL)
goto fail;
if (UProxy->targetIPv4 == NULL && UProxy->targetIPv6 == NULL) {
Log(LOG_LEVEL_DEBUG, "SOCKS5 couldn't resolve domain");
goto fail;
}
// Execute stage 2 ending after DNS resolve
SOCKS5(socksType, &port, UProxy, NULL);
Log(LOG_LEVEL_DEBUG, "SOCKS5 advance to stage 3 (DNS)");
UProxy->stage = UPROXY_STAGE_SOCKS5_RESPONSE;
break;
}
case UPROXY_STAGE_SOCKS5_RESPONSE: {
EVTYPE_CASE(EV_TYPE_READ);
size_t socksRet = SOCKS5(socksType, &port, UProxy, NULL);
if (socksRet == 1) {
if (UProxy->type == PROXY_TYPE_SOCKS5_WITH_UDP) {
Log(LOG_LEVEL_DEBUG, "SOCKS5 advance to stage UDP");
UProxy->stage = UPROXY_STAGE_HTTP_RESPONSE;
int hSock;
UProxy->requestTimeHttpMs = GetUnixTimestampMilliseconds();
if ((hSock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1) {
Log(LOG_LEVEL_DEBUG, "UDP socket");
IP_TYPE ipType = GetIPType(UProxy->ip); // Preffered
if (ipType == IPV4 && UProxy->targetIPv4 == NULL)
ipType = IPV6;
if (ipType == IPV6 && UProxy->targetIPv6 == NULL)
ipType = IPV4;
// -> Real
Log(LOG_LEVEL_DEBUG, "UDP IP Type %d", ipType);
uint8_t *buff = malloc(PROXY_IDENTIFIER_LEN + 6 + (ipType == IPV4 ? IPV4_SIZE : IPV6_SIZE)); {
buff[0] = 0x00;
buff[1] = 0x00;
buff[2] = 0x00;
buff[3] = ipType == IPV4 ? 0x01 : 0x04;
memcpy(&(buff[4]), ipType == IPV4 ? &(UProxy->targetIPv4->Data[3]) : UProxy->targetIPv6->Data, ipType == IPV4 ? IPV4_SIZE : IPV6_SIZE);
*((uint16_t*)&(buff[4 + (ipType == IPV4 ? IPV4_SIZE : IPV6_SIZE)])) = htons(ServerPortUDP);
memcpy(&(buff[6 + (ipType == IPV4 ? IPV4_SIZE : IPV6_SIZE)]), UProxy->identifier, PROXY_IDENTIFIER_LEN);
Log(LOG_LEVEL_DEBUG, "UDP buff construct");
struct sockaddr *sa = IPv6MapToRaw(UProxy->ip, port); {
if (sendto(hSock, buff, PROXY_IDENTIFIER_LEN + 6 + (ipType == IPV4 ? IPV4_SIZE : IPV6_SIZE), 0, sa, GetIPType(UProxy->ip) == IPV4 ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6)) == -1) {
Log(LOG_LEVEL_DEBUG, "UDP send fail");
free(sa);
close(hSock);
free(buff);
goto fail;
}
Log(LOG_LEVEL_DEBUG, "UDP sent ;)");
} free(sa);
} free(buff);
if (UProxy->pageTarget != NULL) {
Log(LOG_LEVEL_DEBUG, "Waiting for UDP response...");
UProxy->udpRead = event_new(levRequestBase, hSock, EV_READ | EV_PERSIST, (event_callback_fn)EVRead, UProxy);
event_add(UProxy->udpRead, NULL);
} else
close(hSock);
}
} else {
Log(LOG_LEVEL_DEBUG, "SOCKS5 stage 3");
UProxy->stage = ((UProxy->targetPort == HTTPS_DEFAULT_PORT && UProxy->pageTarget != NULL) || ProxyIsSSL(UProxy->type)) ? UPROXY_STAGE_SSL_HANDSHAKE : UPROXY_STAGE_HTTP_REQUEST;
Log(LOG_LEVEL_DEBUG, "SOCKS5 advance to stage %d (%s)", UProxy->stage, UProxy->stage == UPROXY_STAGE_SSL_HANDSHAKE ? "SSL" : "HTTP");
}
} else if (socksRet == SOCKS5_RET_STATUS_IPV4_FAILED || socksRet == SOCKS5_RET_STATUS_IPV6_FAILED) {
/*
* Recoverable failure. This may happen when a IPv6/4 address is fed to SOCKS5 proxy but it doesn't support it.
* Wait for IPv4/6 and request again.
*/
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure %s", socksRet == SOCKS5_RET_STATUS_IPV6_FAILED ? "SOCKS5_RET_STATUS_IPV6_FAILED" : "SOCKS5_RET_STATUS_IPV4_FAILED");
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure lookups %d", UProxy->dnsLookupsCount);
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure lookups IPv4 %p", UProxy->targetIPv4);
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure lookups IPv6 %p", UProxy->targetIPv6);
// Empty the failed target so that system wouldn't try to pass it to SOCKS5 proxy again
if (socksRet == SOCKS5_RET_STATUS_IPV6_FAILED)
UProxy->targetIPv6 = NULL;
else
UProxy->targetIPv4 = NULL;
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure lookups IPv4 %p", UProxy->targetIPv4);
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure lookups IPv6 %p", UProxy->targetIPv6);
// Find any existing lookups
ssize_t fLookup = -1;
for (size_t x = 0; x < UProxy->dnsLookupsCount; x++) {
if ((!UProxy->dnsLookups[x]->ipv6 && socksRet == SOCKS5_RET_STATUS_IPV6_FAILED) ||
(UProxy->dnsLookups[x]->ipv6 && socksRet == SOCKS5_RET_STATUS_IPV4_FAILED))
fLookup = x;
}
if (fLookup == -1 && UProxy->targetIPv4 == NULL && UProxy->targetIPv6 == NULL) {
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure just became unrecoverable");
// Screwed
goto fail;
}
// Duplicate uproxy
IPv6Map *prxIp = malloc(sizeof(IPv6Map));
memcpy(prxIp, UProxy->ip, sizeof(IPv6Map));
UNCHECKED_PROXY *newProxy = AllocUProxy(prxIp, UProxy->port, UProxy->type, NULL, UProxy->associatedProxy);
newProxy->targetPort = UProxy->targetPort;
DNS_LOOKUP_ASYNC_EX *curLookup = NULL;
if (fLookup != -1) {
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure lookups fLookup != -1");
curLookup = UProxy->dnsLookups[fLookup];
pthread_mutex_lock(&(curLookup->preDoneLock));
} else {
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure lookups socksRet %s", socksRet == SOCKS5_RET_STATUS_IPV6_FAILED ? "SOCKS5_RET_STATUS_IPV6_FAILED" : "SOCKS5_RET_STATUS_IPV4_FAILED");
if (socksRet == SOCKS5_RET_STATUS_IPV6_FAILED) {
newProxy->targetIPv4 = zalloc(sizeof(IPv6Map));
memcpy(newProxy->targetIPv4, UProxy->targetIPv4, sizeof(IPv6Map));
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure lookups copied IPv4");
} else {
newProxy->targetIPv6 = malloc(sizeof(IPv6Map));
memcpy(newProxy->targetIPv6, UProxy->targetIPv6, sizeof(IPv6Map));
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure copied IPv6");
}
}
if (UProxy->pageTarget != NULL) {
newProxy->pageTarget = malloc(strlen(UProxy->pageTarget) + 1);
strcpy(newProxy->pageTarget, UProxy->pageTarget);
}
newProxy->getResponse = UProxy->getResponse;
newProxy->singleCheckCallback = UProxy->singleCheckCallback;
newProxy->singleCheckCallbackExtraData = UProxy->singleCheckCallbackExtraData;
if (UProxy->targetIPv6 != NULL || UProxy->targetIPv4 != NULL) {
// New proxy will have already resolved IPv4/6
UProxyAdd(newProxy);
RequestAsync(newProxy);
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure lookups added new proxy");
} else {
// Scoop out current DNS lookup from the array so ProxyFree doesn't free it
UProxy->dnsLookupsCount--;
if (UProxy->dnsLookupsCount > 0) {
UProxy->dnsLookups[fLookup] = UProxy->dnsLookups[UProxy->dnsLookupsCount];
} else {
free(UProxy->dnsLookups);
UProxy->dnsLookups = NULL;
}
curLookup->object = newProxy;
curLookup->fxDone = ProxyDNSReResolved;
Log(LOG_LEVEL_DEBUG, "SOCKS5 ip recoverable failure redirected fxDone callback");
}
if (fLookup != -1) {
Log(LOG_LEVEL_DEBUG, "UNLOCK preDoneLock!!!");
pthread_mutex_unlock(&(curLookup->preDoneLock));
}
UProxy->getResponse = false; // Prevent CPage final stage from being launched as if UProxy failed
goto fail; // Free old proxy silently
} else
goto fail;
break;
}
default: {
assert(false);
break;
}
}
break;
}
}
switch (UProxy->stage) {
case UPROXY_STAGE_SSL_HANDSHAKE: {
struct evbuffer *buff = bufferevent_get_input(UProxy->assocBufferEvent);
evbuffer_drain(buff, evbuffer_get_length(buff));
Log(LOG_LEVEL_DEBUG, "Establishing SSL connection...");
// Begin REAL SSL
struct bufferevent *sslBuffEvent;
sslBuffEvent = bufferevent_openssl_socket_new(levRequestBase, bufferevent_getfd(UProxy->assocBufferEvent), SSL_new(RequestBaseSSLCTX), BUFFEREVENT_SSL_CONNECTING, BEV_OPT_CLOSE_ON_FREE | BEV_OPT_THREADSAFE);
bufferevent_setfd(UProxy->assocBufferEvent, -1);
bufferevent_free(UProxy->assocBufferEvent);
UProxy->assocBufferEvent = sslBuffEvent;
if (UProxy->assocBufferEvent != NULL) {
bufferevent_setcb(UProxy->assocBufferEvent, (bufferevent_data_cb)EVRead, (bufferevent_data_cb)EVWrite, (bufferevent_event_cb)EVEvent, UProxy);
bufferevent_enable(UProxy->assocBufferEvent, EV_READ | EV_WRITE);
} else {
Log(LOG_LEVEL_DEBUG, "SSL BuffEvent fail");
goto fail;
}
UProxy->stage = UPROXY_STAGE_HTTP_REQUEST;
Log(LOG_LEVEL_DEBUG, "-> UPROXY_STAGE_HTTP_REQUEST");
break;
}
case UPROXY_STAGE_HTTP_REQUEST: {
EVTYPE_CASE_NOT(EV_TYPE_WRITE);
if ((UProxy->targetPort == HTTPS_DEFAULT_PORT && UProxy->pageTarget != NULL) || ProxyIsSSL(UProxy->type)) {
// SSL
SSL *ssl = bufferevent_openssl_get_ssl(UProxy->assocBufferEvent);
X509 *cert = SSL_get_peer_certificate(ssl); {
uint8_t hash[EVP_MAX_MD_SIZE];
unsigned int trash;
X509_digest(cert, EVP_sha512(), hash, &trash);
if (!MemEqual(hash, SSLFingerPrint, 512 / 8 /* SHA-512 */))
UProxy->invalidCert = X509_dup(cert);
else
UProxy->invalidCert = NULL;
} X509_free(cert);
}
else
UProxy->invalidCert = NULL;
Log(LOG_LEVEL_DEBUG, "UPROXY_STAGE_HTTP_REQUEST");
UProxy->requestTimeHttpMs = GetUnixTimestampMilliseconds();
Log(LOG_LEVEL_DEBUG, "Sending HTTP request");
char *key;
Base64Encode(UProxy->identifier, PROXY_IDENTIFIER_LEN, &key); {
Log(LOG_LEVEL_DEBUG, "Page target: %s", UProxy->pageTarget);
if (UProxy->pageTargetPostData != NULL) {
Log(LOG_LEVEL_DEBUG, "Page target POST data: %s", UProxy->pageTargetPostData);
}
if (UProxy->pageTarget == NULL) {
char *host = GetHost(GetIPType(UProxy->ip), ProxyIsSSL(UProxy->type));
reqString = StrReplaceToNew(RequestString, "{HOST}", host);
StrReplaceOrig(&reqString, "{PAGE_PATH}", "/prxchk");
} else {
char *path;
char *domain = ProxyParseUrl(UProxy, true, true, &path); {
if (domain == NULL) {
free(key);
goto fail;
}
if (UProxy->pageTargetPostData != NULL) {
reqString = StrReplaceToNew(POSTRequestString, "{HOST}", domain);