static gboolean
package_write (xmms_vis_client_t *c, int32_t id, struct timeval *time, int channels, int size, short *buf)
{
if (c->type == VIS_UNIXSHM) {
return write_shm (&c->transport.shm, c, id, time, channels, size, buf);
} else if (c->type == VIS_UDP) {
return write_udp (&c->transport.udp, c, id, time, channels, size, buf, vis->socket);
}
return FALSE;
}
int check_dhcp(const struct arguments *args, const struct udp_session *u,
const uint8_t *data, const size_t datalen) {
// This is untested
// Android routing of DHCP is erroneous
log_android(ANDROID_LOG_WARN, "DHCP check");
if (datalen < sizeof(struct dhcp_packet)) {
log_android(ANDROID_LOG_WARN, "DHCP packet size %d", datalen);
return -1;
}
const struct dhcp_packet *request = (struct dhcp_packet *) data;
if (ntohl(request->option_format) != DHCP_OPTION_MAGIC_NUMBER) {
log_android(ANDROID_LOG_WARN, "DHCP invalid magic %x", request->option_format);
return -1;
}
if (request->htype != 1 || request->hlen != 6) {
log_android(ANDROID_LOG_WARN, "DHCP unknown hardware htype %d hlen %d",
request->htype, request->hlen);
return -1;
}
log_android(ANDROID_LOG_WARN, "DHCP opcode", request->opcode);
// Discover: source 0.0.0.0:68 destination 255.255.255.255:67
// Offer: source 10.1.10.1:67 destination 255.255.255.255:68
// Request: source 0.0.0.0:68 destination 255.255.255.255:67
// Ack: source: 10.1.10.1 destination: 255.255.255.255
if (request->opcode == 1) { // Discover/request
struct dhcp_packet *response = calloc(500, 1);
// Hack
inet_pton(AF_INET, "10.1.10.1", &u->saddr);
/*
Discover:
DHCP option 53: DHCP Discover
DHCP option 50: 192.168.1.100 requested
DHCP option 55: Parameter Request List:
Request Subnet Mask (1), Router (3), Domain Name (15), Domain Name Server (6)
Request
DHCP option 53: DHCP Request
DHCP option 50: 192.168.1.100 requested
DHCP option 54: 192.168.1.1 DHCP server.
*/
memcpy(response, request, sizeof(struct dhcp_packet));
response->opcode = (uint8_t) (request->siaddr == 0 ? 2 /* Offer */ : /* Ack */ 4);
response->secs = 0;
response->flags = 0;
memset(&response->ciaddr, 0, sizeof(response->ciaddr));
inet_pton(AF_INET, "10.1.10.2", &response->yiaddr);
inet_pton(AF_INET, "10.1.10.1", &response->siaddr);
memset(&response->giaddr, 0, sizeof(response->giaddr));
// https://tools.ietf.org/html/rfc2132
uint8_t *options = (uint8_t *) (response + sizeof(struct dhcp_packet));
int idx = 0;
*(options + idx++) = 53; // Message type
*(options + idx++) = 1;
*(options + idx++) = (uint8_t) (request->siaddr == 0 ? 2 : 5);
/*
1 DHCPDISCOVER
2 DHCPOFFER
3 DHCPREQUEST
4 DHCPDECLINE
5 DHCPACK
6 DHCPNAK
7 DHCPRELEASE
8 DHCPINFORM
*/
*(options + idx++) = 1; // subnet mask
*(options + idx++) = 4; // IP4 length
inet_pton(AF_INET, "255.255.255.0", options + idx);
idx += 4;
*(options + idx++) = 3; // gateway
*(options + idx++) = 4; // IP4 length
inet_pton(AF_INET, "10.1.10.1", options + idx);
idx += 4;
*(options + idx++) = 51; // lease time
*(options + idx++) = 4; // quad
*((uint32_t *) (options + idx)) = 3600;
idx += 4;
*(options + idx++) = 54; // DHCP
*(options + idx++) = 4; // IP4 length
inet_pton(AF_INET, "10.1.10.1", options + idx);
idx += 4;
*(options + idx++) = 6; // DNS
*(options + idx++) = 4; // IP4 length
inet_pton(AF_INET, "8.8.8.8", options + idx);
idx += 4;
*(options + idx++) = 255; // End
/*
DHCP option 53: DHCP Offer
DHCP option 1: 255.255.255.0 subnet mask
DHCP option 3: 192.168.1.1 router
DHCP option 51: 86400s (1 day) IP address lease time
DHCP option 54: 192.168.1.1 DHCP server
DHCP option 6: DNS servers 9.7.10.15
*/
write_udp(args, u, (uint8_t *) response, 500);
free(response);
}
return 0;
}
void sendto_udp(int senderid,int sockfd,int datalen,u_char *data,int flags,
struct sockaddr *addr,socklen_t addrlen)
{
uint16_t hostport;
uint16_t dstport;
uint32_t host_IP;
uint32_t dst_IP;
int len=datalen;
int index;
/** check if the original call is either (sendto) or (send) or (write)*/
if ( (addr == NULL) && (addrlen == 0) && (flags != -1000) )
{
/** In case of (send) */
PRINT_DEBUG();
return ( send_udp(senderid,sockfd,datalen,data,flags) ) ;
}
if ( (addr == NULL) && (addrlen == 0) && (flags == -1000))
{
PRINT_DEBUG();
/** In case of (write) */
return ( write_udp (senderid,sockfd,datalen,data) ) ;
}
PRINT_DEBUG();
/** TODO handle flags cases */
switch (flags)
{
case MSG_CONFIRM:
case MSG_DONTROUTE:
case MSG_DONTWAIT :
case MSG_EOR:
case MSG_MORE :
case MSG_NOSIGNAL:
case MSG_OOB: /** case of recieving a (write call)*/
default:
break;
}
PRINT_DEBUG("");
struct sockaddr_in *address;
address = (struct sockaddr_in *) addr;
/** TODO lock access to the jinnisockets */
index = findjinniSocket(senderid,sockfd);
PRINT_DEBUG("");
/** TODO unlock access to the jinnisockets */
if (index == -1)
{
PRINT_DEBUG("CRASH !! socket descriptor not found into jinni sockets");
exit(1);
}
if (address->sin_family != AF_INET )
{
PRINT_DEBUG("Wrong address family");
PRINT_DEBUG("");
sem_wait(jinniSockets[index].s);
PRINT_DEBUG("");
nack_write(jinniSockets[index].jinniside_pipe_ds,senderid,sockfd);
sem_post(jinniSockets[index].as);
sem_post(jinniSockets[index].s);
PRINT_DEBUG("");
}
/** copying the data passed to be able to free the old memory location
* the new created location is the one to be included into the newly created finsFrame*/
PRINT_DEBUG("");
/** Keep all ports and addresses in host order until later action taken */
dstport =ntohs( address->sin_port); /** reverse it since it is in network order after application used htons */
if (dst_IP != INADDR_LOOPBACK)
dst_IP = ntohl(address-> sin_addr.s_addr);/** it is in network format since application used htonl */
else
dst_IP = ntohl(address-> sin_addr.s_addr);
//hostport = jinniSockets[index].hostport;
hostport = 3000;
host_IP = jinniSockets[index].host_IP;
PRINT_DEBUG("");
PRINT_DEBUG("%d,%d,%d,%d", dst_IP, dstport, host_IP,hostport);
//free(data);
//free(addr);
PRINT_DEBUG("");
/** the meta-data paraters are all passes by copy starting from this point
*
*/
if (jinni_UDP_to_fins(data,len,dstport,dst_IP,hostport,host_IP)== 1)
{
PRINT_DEBUG("");
/** TODO prevent the socket interceptor from holding this semaphore before we reach this point */
sem_wait(jinniSockets[index].s);
PRINT_DEBUG("");
ack_write(jinniSockets[index].jinniside_pipe_ds,senderid,sockfd);
sem_post(jinniSockets[index].as);
sem_post(jinniSockets[index].s);
PRINT_DEBUG("");
}
else
{
PRINT_DEBUG("socketjinni failed to accomplish sendto");
sem_wait(jinniSockets[index].s);
nack_write(jinniSockets[index].jinniside_pipe_ds,senderid,sockfd);
sem_post(jinniSockets[index].as);
sem_post(jinniSockets[index].s);
}
return;
} //end of sendto_udp
void send_udp(unsigned long long uniqueSockID, int socketCallType, int datalen,
u_char *data, int flags) {
uint16_t hostport;
uint16_t dstport;
uint32_t host_IP;
uint32_t dst_IP;
int len = datalen;
int index;
if (flags == -1000) {
return (write_udp(uniqueSockID, socketCallType, datalen, data));
}
/** TODO handle flags cases */
switch (flags) {
case MSG_CONFIRM:
case MSG_DONTROUTE:
case MSG_DONTWAIT:
case MSG_EOR:
case MSG_MORE:
case MSG_NOSIGNAL:
case MSG_OOB: /** case of recieving a (write call)*/
default:
break;
} // end of the switch clause
PRINT_DEBUG("");
index = findjinniSocket(uniqueSockID);
if (index == -1) {
PRINT_DEBUG("CRASH !! socket descriptor not found into jinni sockets");
return;
}
/** copying the data passed to be able to free the old memory location
* the new created location is the one to be included into the newly created finsFrame*/
PRINT_DEBUG("");
/** check if this socket already connected to a destined address or not */
if (jinniSockets[index].connection_status == 0) {
/** socket is not connected to an address. Send call will fail */
PRINT_DEBUG("socketjinni failed to accomplish send");
nack_send(uniqueSockID, socketCallType);
return;
}
/** Keep all ports and addresses in host order until later action taken */
dstport = jinniSockets[index].dstport;
dst_IP = jinniSockets[index].dst_IP;
//hostport = jinniSockets[index].hostport;
//hostport = 3000;
/** addresses are in host format given that there are by default already filled
* host IP and host port. Otherwise, a port and IP has to be assigned explicitly below */
/**
* the current value of host_IP is zero but to be filled later with
* the current IP using the IPv4 modules unless a binding has occured earlier
*/
host_IP = jinniSockets[index].host_IP;
/**
* Default current host port to be assigned is 58088
* It is supposed to be randomly selected from the range found in
* /proc/sys/net/ipv4/ip_local_port_range
* default range in Ubuntu is 32768 - 61000
* The value has been chosen randomly when the socket firstly inserted into the jinnisockets
* check insertjinniSocket(processid, sockfd, fakeID, type, protocol);
*/
hostport = jinniSockets[index].hostport;
if (hostport == (uint16_t)(-1)) {
while (1) {
hostport = randoming(MIN_port, MAX_port);
if (checkjinniports(hostport, host_IP)) {
break;
}
}
jinniSockets[index].hostport = hostport;
}
PRINT_DEBUG("");
PRINT_DEBUG("addr %d,%d,%d,%d", dst_IP, dstport, host_IP, hostport);
//free(data);
//free(addr);
PRINT_DEBUG("");
/** the meta-data paraters are all passes by copy starting from this point
*
*/
if (jinni_UDP_to_fins(data, len, dstport, dst_IP, hostport, host_IP) == 1)
{
PRINT_DEBUG("");
/** TODO prevent the socket interceptor from holding this semaphore before we reach this point */
PRINT_DEBUG("");
ack_send(uniqueSockID, socketCallType);
PRINT_DEBUG("");
} else {
PRINT_DEBUG("socketjinni failed to accomplish send");
nack_send(uniqueSockID, socketCallType);
}
}// end of send_udp
