ant-http/plugins/ws.c

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C
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#include "ws.h"
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static void ws_gen_mask_key(ws_msg_header_t * header)
{
int r = rand();
header->mask_key[0] = (r >> 24) & 0xFF;
header->mask_key[1] = (r >> 16) & 0xFF;
header->mask_key[2] = (r >> 8) & 0xFF;
header->mask_key[3] = r & 0xFF;
}
/**
* Read a frame header
* based on this header, we'll decide
* the appropriate handle for frame data
*/
ws_msg_header_t * ws_read_header(int client)
{
uint8_t byte;
uint8_t bytes[8];
ws_msg_header_t* header = (ws_msg_header_t*) malloc(sizeof(*header));
// get first byte
if(recv(client, &byte, sizeof(byte), 0) <0) goto fail;
if(BITV(byte,6) || BITV(byte,5) || BITV(byte,4)) goto fail;// all RSV bit must be 0
//printf("FIN: %d, RSV1: %d, RSV2: %d, RSV3:%d, opcode:%d\n", BITV(byte,7), BITV(byte,6), BITV(byte,5), BITV(byte,4),(byte & 0x0F) );
// find and opcode
header->fin = BITV(byte,7);
header->opcode = (byte & 0x0F);
// get next byte
if(recv(client, &byte, sizeof(byte), 0) <0) goto fail;
//printf("MASK: %d paylen:%d\n", BITV(byte,7), (byte & 0x7F));
// check mask bit, should be 1
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header->mask = BITV(byte,7);
/*if(!BITV(byte,7))
{
// close the connection with protocol error
ws_close(client, 1002);
goto fail;
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}*/
// get the data length of the frame
int len = (byte & 0x7F);
if(len <= 125)
{
header->plen = len;
} else if(len == 126)
{
if(recv(client,bytes, 2*sizeof(uint8_t), 0) <0) goto fail;
header->plen = (bytes[0]<<8) + bytes[1];
} else
{
//read only last 4 byte
if(recv(client,bytes, 8*sizeof(uint8_t), 0) <0) goto fail;
header->plen = (bytes[4]<<24) + (bytes[5]<<16) + (bytes[6] << 8) + bytes[7] ;
}
//printf("len: %d\n", header->plen);
// last step is to get the maskey
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if(header->mask)
if(recv(client,header->mask_key, 4*sizeof(uint8_t), 0) <0) goto fail;
//printf("key 0: %d key 1: %d key2:%d, key3: %d\n",header->mask_key[0],header->mask_key[1],header->mask_key[2], header->mask_key[3] );
// check wheather it is a ping or a close message
// process it and return NULL
//otherwise return the header
//return the header
switch(header->opcode){
case WS_CLOSE: // client requests to close the connection
// send back a close message
ws_close(client,1000);
//goto fail;
break;
case WS_PING: // client send a ping
// send back a pong message
pong(client,header->plen);
break;
default: break;
}
return header;
fail:
free(header);
return NULL;
}
/**
* Read data from client
* and unmask data using the key
*/
int ws_read_data(int client, ws_msg_header_t* header, int len, uint8_t* data)
{
// if len == -1 ==> read all remaining data to 'data';
if(header->plen == 0) return 0;
int dlen = (len==-1 || len > header->plen)?header->plen:len;
if((dlen = recv(client,data, dlen, 0)) <0) return -1;
header->plen = header->plen - dlen;
// unmask received data
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if(header->mask)
for(int i = 0; i < dlen; ++i)
data[i] = data[i]^ header->mask_key[i%4];
data[dlen] = '\0';
return dlen;
}
void _send_header(int client, ws_msg_header_t header)
{
uint8_t byte = 0;
uint8_t bytes[8];
for(int i=0; i< 8; i++) bytes[i] = 0;
//first byte |FIN|000|opcode|
byte = (header.fin << 7) + header.opcode;
//printf("BYTE: %d\n", byte);
send(client, &byte, 1, 0);
// second byte, payload length
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// mask may be 0 or 1
//if(header.mask == 1)
// printf("Data is masked\n");
if(header.plen <= 125)
{
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byte = (header.mask << 7) + header.plen;
send(client, &byte, 1, 0);
}
else if(header.plen < 65536) // 16 bits
{
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byte = (header.mask << 7) + 126;
bytes[0] = (header.plen) >> 8;
bytes[1] = (header.plen) & 0x00FF;
send(client, &byte, 1, 0);
send(client, &bytes, 2, 0);
}
else // > 16 bits
{
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byte = (header.mask << 7) + 127;
bytes[4] = (header.plen) >> 24;
bytes[5] = ((header.plen)>>16) & 0x00FF;
bytes[6] = ((header.plen)>>8) & 0x00FF;
bytes[7] = (header.plen) & 0x00FF;
send(client, &byte, 1, 0);
send(client, &bytes, 8, 0);
}
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// send mask key
if(header.mask)
{
send(client, header.mask_key,4,0);
}
}
/**
* Send a frame to client
*/
void ws_send_frame(int client, uint8_t* data, ws_msg_header_t header)
{
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uint8_t * masked;
masked = data;
if(header.mask)
{
ws_gen_mask_key(&header);
masked = (uint8_t*) malloc(header.plen);
for(int i = 0; i < header.plen; ++i)
masked[i] = data[i]^ header.mask_key[i%4];
}
_send_header(client, header);
if(header.opcode == WS_TEXT)
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send(client,(char*)masked,header.plen,0);
else
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send(client,(uint8_t*)masked,header.plen,0);
if(masked && header.mask)
free(masked);
}
/**
* send a text data frame to client
*/
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void ws_send_text(int client, const char* data,int mask)
{
ws_msg_header_t header;
header.fin = 1;
header.opcode = WS_TEXT;
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header.mask = mask;
header.plen = strlen(data);
//_send_header(client,header);
//send(client, data, header.plen,0);
ws_send_frame(client,data,header);
}
/**
* send a single binary data fram to client
* not tested yet, but should work
*/
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void ws_send_binary(int client, uint8_t* data, int l, int mask)
{
ws_msg_header_t header;
header.fin = 1;
header.opcode = WS_BIN;
header.plen = l;
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header.mask = mask;
ws_send_frame(client,data, header);
//_send_header(client,header);
//send(client, data, header.plen,0);
}
/*
* send a file as binary data
*/
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void ws_send_file(int client, const char* file, int mask)
{
uint8_t buff[1024];
FILE *ptr;
ptr = fopen(file,"rb");
if(!ptr)
{
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ws_close(client,1011);
return;
}
ws_msg_header_t header;
size_t size;
int first_frame = 1;
//ws_send_frame(client,buff,header);
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header.mask = mask;
while(!feof(ptr))
{
size = fread(buff,1,1024,ptr);
if(size >= 0)
{
if(feof(ptr))
header.fin = 1;
else
header.fin = 0;
// clear opcode
if(first_frame)
{
header.opcode = WS_BIN;
first_frame = 0;
}
else
header.opcode = 0;
header.plen = size;
//printf("FIN: %d OC:%d\n", header.fin, header.opcode);
ws_send_frame(client,buff,header);
}
}
fclose(ptr);
}
/**
* Not tested yet
* but should work
*/
void pong(int client, int len)
{
//printf("PONG\n");
ws_msg_header_t pheader;
pheader.fin = 1;
pheader.opcode = WS_PONG;
pheader.plen = len;
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pheader.mask = 0;
uint8_t data[len];
if(recv(client,data, len, 0) < 0) return;
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ws_send_frame(client,data,pheader);
//_send_header(client, pheader);
//send(client, data, len, 0);
}
/*
* Not tested yet, but should work
*/
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void ws_send_close(int client, unsigned int status, int mask)
{
//printf("CLOSED\n");
ws_msg_header_t header;
header.fin = 1;
header.opcode = WS_CLOSE;
header.plen = 2;
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header.mask=mask;
uint8_t bytes[2];
bytes[0] = status >> 8;
bytes[1] = status & 0xFF;
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/*if(mask)
{
// XOR itself
header.mask_key[0] = bytes[0];
header.mask_key[1] = bytes[1];
bytes[0] = bytes[1] ^ bytes[1];
}*/
ws_send_frame(client,bytes,header);
//_send_header(client, header);
//send(client,bytes,2,0);
}
int ip_from_hostname(const char * hostname , char* ip)
{
struct hostent *he;
struct in_addr **addr_list;
int i;
if ( (he = gethostbyname( hostname ) ) == NULL)
{
// get the host info
herror("gethostbyname");
return -1;
}
addr_list = (struct in_addr **) he->h_addr_list;
for(i = 0; addr_list[i] != NULL; i++)
{
//Return the first one;
strcpy(ip , inet_ntoa(*addr_list[i]) );
return 0;
}
return -1;
}
/*
send a request
*/
int request_socket(const char* ip, int port)
{
int sockfd, bytes_read;
struct sockaddr_in dest;
// time out setting
struct timeval timeout;
timeout.tv_sec = CONN_TIME_OUT_S;
timeout.tv_usec = 0;//3 s
if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
{
perror("Socket");
return -1;
}
if (setsockopt (sockfd, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout,sizeof(timeout)) < 0)
perror("setsockopt failed\n");
if (setsockopt (sockfd, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout,sizeof(timeout)) < 0)
perror("setsockopt failed\n");
/*struct linger lingerStruct;
lingerStruct.l_onoff = 0; // turn lingering off for sockets
setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &lingerStruct, sizeof(lingerStruct));*/
bzero(&dest, sizeof(dest));
dest.sin_family = AF_INET;
dest.sin_port = htons(port);
if ( inet_aton(ip, &dest.sin_addr.s_addr) == 0 )
{
perror(ip);
close(sockfd);
return -1;
}
if ( connect(sockfd, (struct sockaddr*)&dest, sizeof(dest)) != 0 )
{
close(sockfd);
perror("Connect");
return -1;
}
return sockfd;
}
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//TODO: The ping request
int ws_open_hand_shake(const char* host, int port, const char* resource)
{
char ip[100];
char buff[MAX_BUFF];
char* rq = NULL;
int size;
// request socket
ip_from_hostname(host ,ip);
int sock = request_socket(ip, port);
if(sock <= 0) return -1;
// now send ws request handshake
rq = __s(CLIENT_RQ,resource,host);
// printf("%s\n",rq);
size = send(sock, rq, strlen(rq),0);
if(size != strlen(rq))
{
printf("Cannot send request \n");
close(sock);
return -1;
}
// now verify if server accept the socket
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size = read_buf(sock,buff,MAX_BUFF);
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char* token;
int done = 0;
while (size > 0 && strcmp("\r\n",buff))
{
char* line = strdup(buff);
//printf("LINE %s\n", line);
token = strsep(&line,":");
trim(token,' ');
if(token != NULL &&strcasecmp(token,"Sec-WebSocket-Accept") == 0)
{
token = strsep(&line,":");
trim(token,' ');
trim(token,'\n');
trim(token,'\r');
//printf("Key found %s \n", token);
if(strcasecmp(token, SERVER_WS_KEY) == 0)
{
// printf("Handshake sucessfull\n");
done = 1;
} else
{
printf("Wrong key %s vs %s\n",token,SERVER_WS_KEY);
close(sock);
return -1;
}
}
//if(line) free(line);
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size = read_buf(sock,buff,MAX_BUFF);
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}
if(done) return sock;
//printf("No server key found \n");
return -1;
}
char* get_ip_address()
{
struct ifaddrs* addrs;
getifaddrs(&addrs);
struct ifaddrs* tmp = addrs;
char* ip;
while (tmp)
{
if (tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_INET)
{
struct sockaddr_in *pAddr = (struct sockaddr_in *)tmp->ifa_addr;
ip = inet_ntoa(pAddr->sin_addr);
if(strcmp(ip,"127.0.0.1") != 0)
return ip;
}
tmp = tmp->ifa_next;
}
freeifaddrs(addrs);
return "127.0.0.1";
}