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soon i will be able to do things

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maybe if i read the tao te ching n+1 times i will finally understand it
This commit is contained in:
reemo 2023-12-20 14:45:42 -06:00
parent 9e878405e3
commit f48f399022
3 changed files with 88 additions and 42 deletions
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1
src/main.c
View file

@ -33,6 +33,7 @@ struct {
/************/
int main(int argc, char** argv) {
srand(time(NULL));
FILE* fp;
switch(argc) {

126
src/wsock.c
View file

@ -67,6 +67,9 @@ void buffer_append_str(buffer_t* buf, const char* data) {
}
int _buffer_read(buffer_t* buf, char* out, int n) {
if(buffer_length(buf) == 0)
return 0;
int i = 0;
while(buf != NULL && (!n || (n && i < n))) {
if(!n || buf->length <= n - i) {
@ -88,13 +91,17 @@ int buffer_peek(buffer_t* buf, char* out, int length) {
int buffer_peek_str(buffer_t* buf, char* out, int length) {
int read = _buffer_read(buf, out, length);
out[read] = '\0';
if(read)
out[read] = '\0';
return read;
}
int buffer_read(buffer_t* buf, char** out) {
int length = buffer_length(buf);
*out = malloc(length);
if(length)
*out = malloc(length);
else
*out = NULL;
_buffer_read(buf, *out, 0);
return length;
@ -102,8 +109,11 @@ int buffer_read(buffer_t* buf, char** out) {
int buffer_read_str(buffer_t* buf, char** out) {
int length = buffer_length(buf);
*out = malloc(length + 1);
(*out)[length] = '\0';
if(length) {
*out = malloc(length + 1);
(*out)[length] = '\0';
} else
*out = NULL;
_buffer_read(buf, *out, 0);
return length;
@ -160,19 +170,24 @@ int _wsock_read_header(char* head, _ws_head_t* out) {
out->head_length = _wsock_header_length(head);
out->fin = 0x80 & head[0];
out->opcode = 0x0F & head[0];
if(out->opcode == WS_CONT &&
out->first->opcode == WS_OP_UNDEF)
return -1;
if(out->opcode != WS_CONT && !WS_OP_IS_CTRL(out->opcode))
out->first_opcode = out->opcode;
out->masked = 0x80 & head[1];
if((head[0] & 0x70) != 0)
// garbage in check
if((head[0] & 0x70) != 0
|| ((head[0] & 0x0F) > 0x2 && (head[0] & 0x0F) < 0x8)
|| ((head[0] & 0x0F) > 0xA && (head[0] & 0x0F) <= 0xF))
return -1;
if((head[0] & 0x0F) > 0x2 && (head[0] & 0x0F) < 0x8)
return -1;
if((head[0] & 0x0F) > 0xA && (head[0] & 0x0F) <= 0xF)
// invalid parameters check
if((out->opcode == WS_CONT &&
out->first_opcode == WS_OP_UNDEF)
|| (out->opcode != WS_CONT &&
!WS_IS_OP_CTRL(out->opcode) &&
out->first_opcode != WS_OP_UNDEF)
|| (WS_IS_OP_CTRL(out->opcode) && !out->fin))
return -1;
// cache first opcode of fragmented data set
if(out->opcode != WS_CONT && !WS_OP_IS_CTRL(out->opcode))
out->first_opcode = out->opcode;
int mask_start;
if((head[1] & 0x7F) < 0x7E) {
@ -189,6 +204,16 @@ int _wsock_read_header(char* head, _ws_head_t* out) {
memcpy(out->mask, head + mask_start, 4);
}
void _wsock_mask(char* mask, char* msg, int length) {
for(int i = 0; i < length; ++i)
msg[i] = msg[i] ^ mask[i % 4];
}
void _wsock_gen_mask(char* mask) {
for(int i = 0; i < 4; ++i)
mask[i] = rand() % 0xFF;
}
wsock_t* wsock_open
(const char* host, const char* path, uint16_t port)
{
@ -264,12 +289,11 @@ wsock_t* wsock_open
wsock_t* wsock = malloc(sizeof(wsock_t));
wsock->sock = sock;
wsock->mode = WS_BLOCK;
wsock->mode = WS_BLOCK | WS_FULL_RECV;
wsock->head_buf.first_opcode = WS_OP_UNDEF;
wsock->head_buf.opcode = WS_OP_UNDEF;
wsock->recv_buf = buffer_create();
wsock->frag_buf = buffer_create();
wsock->ctrl_buf = buffer_create();
return wsock;
}
@ -337,62 +361,83 @@ int wsock_recv(wsock_t* ws, char** out) {
// work provided wsock_recv is called enough times
// that the wsock buffer eventually received all
// information off of the recv buffer
int buflen = buffer_length(
WS_OP_IS_CTRL(ws->head_buf.opcode)
? ws->ctrl_buf : ws->recv_buf);
int buflen = buffer_length(ws->recv_buf);
flags = (ws->mode & WS_NOBLOCK) ? MSG_DONTWAIT : 0;
got = _srecv(ws, tmp, __MIN(sizeof(tmp), ws->head_buf.body_length - buflen), flags);
if(got < 0)
return got;
else if(got > 0)
buffer_append((WS_OP_IS_CTRL(ws->head_buf.opcode)
? ws->ctrl_buf : ws->recv_buf), tmp, got);
buffer_append(ws->recv_buf, tmp, got);
if(got + buflen < ws->head_buf.body_length && got >= 0) {
if(got + buflen < ws->head_buf.body_length) {
got = 0;
continue;
}
}
char* body;
int body_length = buffer_flush(ws->recv_buf, &packet);
if(body != NULL) {
if(ws->head_buf.masked)
_ws_mask(body, ws->head_buf.mask, body_length);
if(!WS_PACKET_IS_CTRL(ws->head_buf.opcode)) {
buffer_append(ws->frag_buf, body, body_length);
free(body);
}
}
switch(ws->head_buf.opcode) {
case WS_CONT:
case WS_TEXT:
case WS_BIN:
if(ws->head_buf.fin) {
if(ws->head_buf.first_opcode == WS_TEXT
&& !(ws->mode & WS_RECV_ALL_BIN))
got = buffer_flush_str(ws->frag_buf, out);
else
got = buffer_flush(ws->frag_buf, out);
ws->head_buf.first_opcode = WS_OP_UNDEF;
}
break;
case WS_CLOSE:
wsock_close(ws);
return -1;
case WS_PING:
wsock_send_raw(ws, WS_PONG, body, body_length);
break;
}
if(ws->head_buf.fin) {
if(!WS_OP_IS_CTRL(ws->opcode)) {
buffer_clear(ws->recv_buf);
ws->head_buf.first_opcode = WS_OP_UNDEF;
} else
buffer_clear(ws->ctrl_buf);
} else if(WS_OP_IS_CTRL(ws->opcode)) {
wsock_close(ws);
return -1;
}
if(WS_OP_IS_CTRL(ws->head_buf.opcode))
free(body);
int opcode_was = ws->head_buf.opcode;
ws->head_buf.opcode = WS_OP_UNDEF;
if(WS_OP_IS_CTRL(opcode_was) ||
(!WS_OP_IS_CTRL(opcode_was) &&
ws->head_buf.body_length == 0))
if(WS_OP_IS_CTRL(opcode_was) || !ws->head_buf.fin) {
got = 0;
continue;
else
} else
break;
} while(ws->mode & WS_FULL_RECV);
return got;
// catches a weird potential case where the server sends
// empty data frames which will exit the main loop with
// the same condition as a nonblocking call that would
// block. to prevent confusion and the proper functioning
// of the WS_FULL_RECV flag, call recursively in this case
if(ws->mode & WS_FULL_RECV && got == 0)
return wsock_recv(ws, out);
else
return got;
}
int wsock_send_raw
(wsock_t* ws, int opcode, char* body, int length)
{
if(!wsock_is_open(ws))
return -1;
}
int wsock_is_open(wsock_t* ws) {
@ -413,7 +458,6 @@ void wsock_free(wsock_t* ws) {
wsock_close(ws);
buffer_free(ws->recv_buf);
buffer_free(ws->frag_buf);
buffer_free(ws->ctrl_buf);
free(ws);
}

3
src/wsock.h
View file

@ -109,7 +109,7 @@ typedef enum {
typedef struct {
int sock, mode;
_ws_head_t head_buf;
buffer_t *recv_buf, *frag_buf, *ctrl_buf;
buffer_t *recv_buf, *frag_buf;
} wsock_t;
wsock_t* wsock_open(const char*, const char*, uint16_t);
@ -117,6 +117,7 @@ void wsock_mode_set(wsock_t*, int);
int wsock_mode_get(wsock_t*);
int wsock_recv(wsock_t*, char**);
int wsock_send_raw(wsock_t*, int, char*, int);
int wsock_send(wsock_t*, char*, int);
int wsock_send_str(wsock_t*, char*);