c-libp2p/net/protocol.c

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#include <stdlib.h>
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#include <string.h>
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#include "libp2p/utils/logger.h"
#include "libp2p/net/protocol.h"
/*
* Handle the different protocols
*/
/***
* Compare incoming to see if they are requesting a protocol upgrade
* @param incoming the incoming string
* @param incoming_size the size of the incoming string
* @param test the protocol string to compare it with (i.e. "/secio" or "/nodeio"
* @returns true(1) if there was a match, false(0) otherwise
*/
const struct Libp2pProtocolHandler* protocol_compare(struct StreamMessage* msg, struct Libp2pVector* protocol_handlers) {
for(int i = 0; i < protocol_handlers->total; i++) {
const struct Libp2pProtocolHandler* handler = (const struct Libp2pProtocolHandler*) libp2p_utils_vector_get(protocol_handlers, i);
if (handler->CanHandle(msg)) {
return handler;
}
}
return NULL;
}
/**
* Allocate resources for a new Libp2pProtocolHandler
* @returns an allocated struct
*/
struct Libp2pProtocolHandler* libp2p_protocol_handler_new() {
struct Libp2pProtocolHandler* h = (struct Libp2pProtocolHandler*) malloc(sizeof(struct Libp2pProtocolHandler));
if (h != NULL) {
h->CanHandle = NULL;
h->HandleMessage = NULL;
h->Shutdown = NULL;
h->context = NULL;
}
return h;
}
/***
* Handle an incoming message
* @param message the incoming message
* @param session the SessionContext of the incoming connection
* @param handlers a Vector of protocol handlers
* @returns -1 on error, 0 if everything was okay, but the daemon should no longer handle this connection, 1 on success
*/
int libp2p_protocol_marshal(struct StreamMessage* msg, struct Stream* stream, struct Libp2pVector* handlers) {
const struct Libp2pProtocolHandler* handler = protocol_compare(msg, handlers);
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if (handler == NULL) {
// turn msg->data to a null terminated string for the error message
char str[msg->data_size + 1];
memcpy(str, msg->data, msg->data_size);
str[msg->data_size] = 0;
for(int i = 0; i < msg->data_size; i++) {
if (str[i] == '\n') {
str[i] = 0;
break;
}
}
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return -1;
}
return handler->HandleMessage(msg, stream, handler->context);
}
/***
* Shut down all protocol handlers and free vector
* @param handlers vector of Libp2pProtocolHandler
* @returns true(1)
*/
int libp2p_protocol_handlers_shutdown(struct Libp2pVector* handlers) {
for(int i = 0; i < handlers->total; i++) {
struct Libp2pProtocolHandler* handler = (struct Libp2pProtocolHandler*)libp2p_utils_vector_get(handlers, i);
handler->Shutdown(handler->context);
}
libp2p_utils_vector_free(handlers);
return 1;
}