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#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <unistd.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <errno.h>

#include <pthread.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <netinet/tcp.h>

#include <malloc.h>

#include "common.h"

#include "log.h"

#include "appconfig.h"

#include "url.h"

#include "web_buffer.h"

#include "web_client.h"

#include "web_server.h"

#include "global_statistics.h"

#include "rrd.h"

#include "rrd2json.h"

#include "../config.h"

int listen_backlog = LISTEN_BACKLOG;

int listen_fd = -1;

int listen_port = LISTEN_PORT;

#ifdef NETDATA_INTERNAL_CHECKS

static void log_allocations(void)

{

static int mem = 0;

struct mallinfo mi;

mi = mallinfo();

if(mi.uordblks > mem) {

int clients = 0;

struct web_client *w;

for(w = web_clients; w ; w = w->next) clients++;

info("Allocated memory increased from %d to %d (increased by %d bytes). There are %d web clients connected.", mem, mi.uordblks, mi.uordblks - mem, clients);

mem = mi.uordblks;

}

}

#endif

static int is_ip_anything(const char *ip)

{

if(!ip || !*ip

|| !strcmp(ip, "any")

|| !strcmp(ip, "all")

|| !strcmp(ip, "*")

|| !strcmp(ip, "::")

|| !strcmp(ip, "0.0.0.0")

) return 1;

return 0;

}

int create_listen_socket4(const char *ip, int port, int listen_backlog)

{

int sock;

int sockopt = 1;

struct sockaddr_in name;

debug(D_LISTENER, "IPv4 creating new listening socket on port %d", port);

sock = socket(AF_INET, SOCK_STREAM, 0);

if(sock < 0) {

error("IPv4 socket() failed.");

return -1;

}

/* avoid "address already in use" */

setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*)&sockopt, sizeof(sockopt));

memset(&name, 0, sizeof(struct sockaddr_in));

name.sin_family = AF_INET;

name.sin_port = htons (port);

if(is_ip_anything(ip)) {

name.sin_addr.s_addr = htonl(INADDR_ANY);

info("Listening on any IPs (IPv4).");

}

else {

int ret = inet_pton(AF_INET, ip, (void *)&name.sin_addr.s_addr);

if(ret != 1) {

error("Failed to convert IP '%s' to a valid IPv4 address.", ip);

close(sock);

return -1;

}

info("Listening on IP '%s' (IPv4).", ip);

}

if(bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {

close(sock);

error("IPv4 bind() failed.");

return -1;

}

if(listen(sock, listen_backlog) < 0) {

close(sock);

fatal("IPv4 listen() failed.");

return -1;

}

debug(D_LISTENER, "IPv4 listening port %d created", port);

return sock;

}

int create_listen_socket6(const char *ip, int port, int listen_backlog)

{

int sock = -1;

int sockopt = 1;

struct sockaddr_in6 name;

debug(D_LISTENER, "IPv6 creating new listening socket on port %d", port);

sock = socket(AF_INET6, SOCK_STREAM, 0);

if (sock < 0) {

error("IPv6 socket() failed. Disabling IPv6.");

return -1;

}

/* avoid "address already in use" */

setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*)&sockopt, sizeof(sockopt));

memset(&name, 0, sizeof(struct sockaddr_in6));

name.sin6_family = AF_INET6;

name.sin6_port = htons ((uint16_t) port);

if(is_ip_anything(ip)) {

name.sin6_addr = in6addr_any;

info("Listening on all IPs (IPv6 and IPv4)");

}

else {

int ret = inet_pton(AF_INET6, ip, (void *)&name.sin6_addr.s6_addr);

if(ret != 1) {

error("Failed to convert IP '%s' to a valid IPv6 address. Disabling IPv6.", ip);

close(sock);

return -1;

}

info("Listening on IP '%s' (IPv6)", ip);

}

name.sin6_scope_id = 0;

if (bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {

close(sock);

error("IPv6 bind() failed. Disabling IPv6.");

return -1;

}

if (listen(sock, listen_backlog) < 0) {

close(sock);

error("IPv6 listen() failed. Disabling IPv6.");

return -1;

}

debug(D_LISTENER, "IPv6 listening port %d created", port);

return sock;

}

// --------------------------------------------------------------------------------------

// the main socket listener

// 1. it accepts new incoming requests on our port

// 2. creates a new web_client for each connection received

// 3. spawns a new pthread to serve the client (this is optimal for keep-alive clients)

// 4. cleans up old web_clients that their pthreads have been exited

void *socket_listen_main(void *ptr)

{

if(ptr) { ; }

info("WEB SERVER thread created with task id %d", gettid());

struct web_client *w;

struct timeval tv;

int retval;

if(ptr) { ; }

if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)

error("Cannot set pthread cancel type to DEFERRED.");

if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)

error("Cannot set pthread cancel state to ENABLE.");

web_client_timeout = (int) config_get_number("global", "disconnect idle web clients after seconds", DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS);

web_enable_gzip = config_get_boolean("global", "enable web responses gzip compression", web_enable_gzip);

if(listen_fd < 0) fatal("LISTENER: Listen socket is not ready.");

fd_set ifds, ofds, efds;

int fdmax = listen_fd;

FD_ZERO (&ifds);

FD_ZERO (&ofds);

FD_ZERO (&efds);

for(;;) {

tv.tv_sec = 0;

tv.tv_usec = 200000;

if(listen_fd >= 0) {

FD_SET(listen_fd, &ifds);

FD_SET(listen_fd, &efds);

}

// debug(D_WEB_CLIENT, "LISTENER: Waiting...");

retval = select(fdmax+1, &ifds, &ofds, &efds, &tv);

if(retval == -1) {

error("LISTENER: select() failed.");

continue;

}

else if(retval) {

// check for new incoming connections

if(FD_ISSET(listen_fd, &ifds)) {

w = web_client_create(listen_fd);

if(unlikely(!w)) {

// no need for error log - web_client_create already logged the error

continue;

}

if(pthread_create(&w->thread, NULL, web_client_main, w) != 0) {

error("%llu: failed to create new thread for web client.");

w->obsolete = 1;

}

else if(pthread_detach(w->thread) != 0) {

error("%llu: Cannot request detach of newly created web client thread.", w->id);

w->obsolete = 1;

}

}

else debug(D_WEB_CLIENT, "LISTENER: select() didn't do anything.");

}

//else {

// debug(D_WEB_CLIENT, "LISTENER: select() timeout.");

//}

// cleanup unused clients

for(w = web_clients; w ; w = w?w->next:NULL) {

if(w->obsolete) {

debug(D_WEB_CLIENT, "%llu: Removing client.", w->id);

// pthread_join(w->thread, NULL);

w = web_client_free(w);

#ifdef NETDATA_INTERNAL_CHECKS

log_allocations();

#endif

}

}

}

error("LISTENER: exit!");

if(listen_fd >= 0) close(listen_fd);

exit(2);

return NULL;

}