Initial API implementation.
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215
core/api.c
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215
core/api.c
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/**
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* Methods for lightweight/specific HTTP for API communication.
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*/
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#include <pthread.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <arpa/inet.h>
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#include "libp2p/net/p2pnet.h"
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#include "libp2p/utils/logger.h"
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#include "ipfs/core/api.h"
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volatile int conns_count;
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pthread_t listen_thread = 0;
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struct s_list api_list;
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/**
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* Create a new bitswap exchange
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* @param ptr is the connection index in api_list, integer not pointer, cast required.
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* @returns nothing
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*/
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void *api_connection_thread (void *ptr)
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{
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int timeout, s, r;
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const INT_TYPE i = (INT_TYPE) ptr;
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char buf[MAX_READ+1];
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char client[INET_ADDRSTRLEN];
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buf[MAX_READ] = '\0';
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s = api_list.conns[i]->socket;
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timeout = api_list.timeout;
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if (socket_read_select4(s, timeout) <= 0) {
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libp2p_logger_error("api", "Client connection timeout.\n");
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goto quit;
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}
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r = read(s, buf, sizeof buf);
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if (r <= 0) {
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libp2p_logger_error("api", "Read from client fail.\n");
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goto quit;
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}
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buf[r] = '\0';
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if (cstrstart(buf, "GET ")) {
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// just an error message, because it's not used.
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write_cstr (s, "HTTP/1.1 404 Not Found\r\n"
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"Content-Type: text/plain; charset=utf-8\r\n"
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"X-Content-Type-Options: nosniff\r\n"
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"Content-Length: 19\r\n\r\n"
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"404 page not found\n");
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//} else if (cstrstart(buf, "POST ")) {
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// TODO: Handle chunked/gzip/form-data/json POST requests.
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} else {
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write_cstr (s, "HTTP/1.1 400 Bad Request\r\n"
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"Content-Type: text/plain\r\n"
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"Connection: close\r\n\r\n"
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"400 Bad Request");
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}
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quit:
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if (inet_ntop(AF_INET, &(api_list.conns[i]->ipv4), client, INET_ADDRSTRLEN) == NULL)
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strcpy(client, "UNKNOW");
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libp2p_logger_error("api", "Closing client connection %s:%d (%d).\n", client, api_list.conns[i]->port, i+1);
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close(s);
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free (api_list.conns[i]);
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api_list.conns[i] = NULL;
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conns_count--;
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return NULL;
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}
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/**
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* Close all connections stopping respectives pthreads and free allocated memory.
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*/
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void api_connections_cleanup (void)
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{
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int i;
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if (conns_count > 0 && api_list.conns) {
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for (i = 0 ; i < api_list.max_conns ; i++) {
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if (api_list.conns[i]->pthread) {
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pthread_cancel (api_list.conns[i]->pthread);
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close (api_list.conns[i]->socket);
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free (api_list.conns[i]);
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api_list.conns[i] = NULL;
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}
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}
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conns_count = 0;
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}
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if (api_list.conns) {
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free (api_list.conns);
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api_list.conns = NULL;
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}
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}
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/**
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* Pthread to keep in background dealing with client connections.
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* @param ptr is not used.
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* @returns nothing
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*/
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void *api_listen_thread (void *ptr)
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{
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int s;
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INT_TYPE i;
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uint32_t ipv4;
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uint16_t port;
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char client[INET_ADDRSTRLEN];
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conns_count = 0;
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for (;;) {
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s = socket_accept4(api_list.socket, &ipv4, &port);
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if (s <= 0) {
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break;
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}
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if (conns_count >= api_list.max_conns) { // limit reached.
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libp2p_logger_error("api", "Limit of connections reached (%d).\n", api_list.max_conns);
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close (s);
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continue;
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}
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conns_count++;
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for (i = 0 ; i < api_list.max_conns && api_list.conns[i] ; i++);
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api_list.conns[i] = malloc (sizeof (struct s_conns));
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if (!api_list.conns[i]) {
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libp2p_logger_error("api", "Fail to allocate memory to accept connection.\n");
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close (s);
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continue;
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}
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if (inet_ntop(AF_INET, &ipv4, client, INET_ADDRSTRLEN) == NULL)
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strcpy(client, "UNKNOW");
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libp2p_logger_error("api", "Accept connection %s:%d (%d/%d), pthread %d.\n", client, port, conns_count, api_list.max_conns, i+1);
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api_list.conns[i]->socket = s;
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api_list.conns[i]->ipv4 = ipv4;
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api_list.conns[i]->port = port;
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if (pthread_create(&(api_list.conns[i]->pthread), NULL, api_connection_thread, (void*)i)) {
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libp2p_logger_error("api", "Create pthread fail.\n");
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free (api_list.conns[i]);
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api_list.conns[i] = NULL;
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conns_count--;
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close(s);
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}
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}
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api_connections_cleanup ();
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return NULL;
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}
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/**
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* Start API interface daemon.
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* @param port.
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* @param max_conns.
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* @param timeout time out of client connection.
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* @returns 0 when failure or 1 if success.
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*/
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int api_start (uint16_t port, int max_conns, int timeout)
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{
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int s;
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size_t alloc_size = sizeof(void*) * max_conns;
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api_list.ipv4 = hostname_to_ip("127.0.0.1"); // api is listening only on loopback.
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api_list.port = port;
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if (listen_thread != 0) {
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libp2p_logger_error("api", "API already running.\n");
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return 0;
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}
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if ((s = socket_listen(socket_tcp4(), &(api_list.ipv4), &(api_list.port))) <= 0) {
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libp2p_logger_error("api", "Failed to init API. port: %d\n", port);
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return 0;
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}
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api_list.socket = s;
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api_list.max_conns = max_conns;
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api_list.timeout = timeout;
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api_list.conns = malloc (alloc_size);
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if (!api_list.conns) {
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close (s);
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libp2p_logger_error("api", "Error allocating memory.\n");
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return 0;
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}
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memset(api_list.conns, 0, alloc_size);
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if (pthread_create(&listen_thread, NULL, api_listen_thread, NULL)) {
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close (s);
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free (api_list.conns);
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api_list.conns = NULL;
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listen_thread = 0;
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libp2p_logger_error("api", "Error creating thread for API.\n");
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return 0;
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}
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return 1;
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}
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/**
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* Stop API.
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* @returns 0 when failure or 1 if success.
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*/
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int api_stop (void)
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{
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if (!listen_thread) return 0;
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pthread_cancel(listen_thread);
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api_connections_cleanup ();
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listen_thread = 0;
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return 1;
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}
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35
include/ipfs/core/api.h
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35
include/ipfs/core/api.h
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@ -0,0 +1,35 @@
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#pragma once
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#ifdef __x86_64__
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#define INT_TYPE uint64_t
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#else
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#define INT_TYPE uint32_t
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#endif
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#define MAX_READ (32*1024) // 32k
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struct s_list {
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int socket;
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uint32_t ipv4;
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uint16_t port;
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int max_conns;
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int timeout;
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struct s_conns {
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int socket;
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uint32_t ipv4;
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uint16_t port;
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pthread_t pthread;
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} **conns;
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};
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#define write_cstr(f,s) write(f,s,sizeof(s)-1)
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#define write_str(f,s) write(f,s,strlen(s))
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#define cstrstart(a,b) (memcmp(a,b,sizeof(b)-1)==0)
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#define strstart(a,b) (memcmp(a,b,strlen(b))==0)
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void *api_connection_thread (void *ptr);
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void api_connections_cleanup (void);
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void *api_listen_thread (void *ptr);
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int api_start (uint16_t port, int max_conns, int timeout);
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int api_stop (void);
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